Double-Blind, Placebo-Controlled Trial of Ketamine Therapy in Treatment-Resistant Depression (TRD)

• Sponsor: Massachusetts General Hospital (Other)
• Overall Status: Completed
• CT.gov ID: NCT01920555
• Collaborator: National Institute of Mental Health (NIMH) (NIH), Baylor College of Medicine (Other), Icahn School of Medicine at Mount Sinai (Other), Stanford University (Other), University of Texas (Other), Yale University (Other)
• Enrollment: 99
• Locations: 6
• Arms: 5
• Duration (Months): 26.1
• Patients Per Site: 16.5
• Patients Per Site Per Month: 0.6

Study Details

Study Description

Brief Summary

This study is looking at the efficacy, durability, safety, and tolerability of multiple single doses of Ketamine vs. active placebo for treating patients with treatment resistant depression who are taking an antidepressant that is not working for them.

Condition or Disease	Intervention/Treatment	Phase
Treatment Resistant Depression	Drug: Ketamine; Drug: Ketamine; Drug: Ketamine; Drug: Ketamine; Drug: Placebo Midazolam	Phase 2

Detailed Description

The primary objective is to investigate whether all doses (0.1 mg/kg, 0.2 mg/kg, 0.5 mg/kg, and 1.0 mg/kg) of ketamine are superior to active placebo (midazolam 0.045 mg/kg) therapy in the acute treatment of patients with treatment resistant depression within 72 hours (Day 3), when added to ongoing and stable antidepressant therapy.

Study Design

• Study Type: Interventional
• Actual Enrollment: 99 participants
• Allocation: Randomized
• Intervention Model: Parallel Assignment
• Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
• Primary Purpose: Treatment
• Official Title: Double-Blind, Placebo-Controlled Trial of Ketamine Therapy in Treatment-Resistant Depression (TRD)
• Study Start Date: Dec 1, 2014
• Actual Primary Completion Date: Jan 1, 2017
• Actual Study Completion Date: Feb 1, 2017

Arms and Interventions

Arm	Intervention/Treatment
Active Comparator: Ketamine 0.1mg Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion	Drug: Ketamine; Dose of Ketamine will be 0.1 mg/kg - one single infusion
Active Comparator: Ketamine 0.2mg Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion	Drug: Ketamine; Dose of Ketamine will be 0.2 mg/kg - one single infusion
Active Comparator: Ketamine 0.5mg Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion	Drug: Ketamine; Dose of Ketamine will be 0.5 mg/kg - one single infusion
Active Comparator: Ketamine 1.0mg Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion	Drug: Ketamine; Dose of Ketamine will be 1.0 mg/kg - one single infusion
Placebo Comparator: Midazolam (Active Placebo) Patients in this arm will receive 0.045 mg/kg of midazolam - one single infusion	Drug: Placebo Midazolam; Dose of Midazolam (active placebo) will be 0.045 mg/kg - one single infusion

Outcome Measures

Primary Outcome Measures

1. Hamilton Rating Scale for Depression - 6 Items [A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1, & 3]

   The HAMD6 is a 6-item clinician-rated scale, where clinicians rate the presence of depression symptoms (i.e., depressed mood, guilt, work and interests, psychomotor retardation, psychic anxiety, somatic symptoms) on a 5-point scale, where 0 = not present, and 1-4 represent increasingly severe symptoms. One item (i.e., somatic symptoms) is rated on only a 3-point scale, ranging from 0-2. The possible scale range is 0-22, where higher values represent more severe depression. This instrument is completed with a structured interview guide by the clinician based on his/her assessment of the patient's symptoms. This structured interview has been validated for use with time frames shorter than one week. In this study, the HAMD6 was used to assess symptoms occurring in the past 24 hours.

Secondary Outcome Measures

1. Montgomery-Asberg Depression Rating Scale (MADRS) [A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0 and 3.]

   The MADRS is a 10-item clinician-rated scale measuring depression severity. Symptoms are rated on a 7-point scale, where 0 = "not present", and 1-6 represent increasing severity. Values 2, 4, and 6 have specific anchoring text (e.g., 2="Difficulties in starting activities." 4="Difficulties in starting simple routine activities which are carried out with effort, 6="Complete lassitude. Unable to do anything without help.") Values 1, 3, and 5 do not have specific text. The possible scale range is 0-60, where higher values represent higher severity. In this study, the MADRS was used to rate symptoms occurring in the past 3 days.

2. Clinical Global Impressions-Severity (CGI-S) [A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3]

   The CGI-S is a clinician rated single-item scale: "How depressed is the patient at this time?", rated on a 7-point response scale: 1 = Normal, not at all depressed, 2 = Borderline depressed, 3 = Mildly depressed, 4 = Moderately depressed. 5 = Markedly depressed, 6 = severely depressed, 7 = Among the most severely depressed patients. When rating patients, clinicians were asked to consider the past 24 hours.

3. Clinical Global Impressions-Improvement (CGI-I) Scale [A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3]

   The CGI-I is a clinician rated single-item scale: "Compared to the patient's condition at admission, how much has the patient changed?", rated on a 7-point response scale: 1 = Very much improved, 2 = Much improved, 3 = Minimally improved, 4 = No change, 5 = Minimally worse, 6 = Much worse, and 7 = Very much worse. In this case, "admission" referred to the CGI-S screening assessments performed between Day -28 an -7, one conducted during the screening visit, and a second rating conducted by a remote, independent rater.

4. Symptoms of Depression Questionnaire (SDQ) [A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3]

   The SDQ is a 44-item self-report scale, which aims to measure depression more comprehensively by including the assessment of symptoms in the anxiety-depression spectrum, including symptoms of irritability, anger attacks, and anxiety. Items are rated on an 6-point Likert scale, where participants are asked to rate if a specific symptom (e.g. "How has your mood been over the past 24 hours?") is normal for him or her (score = 2), what is better than normal (score = 1), and what is worse than normal (scores = 3-6). The total scale score is calculated by averaging across the items, resulting in a possible range from 1 to 6. Higher scores indicate greater depression severity. When rating, patients were asked to consider their symptoms during the past 24 hours.

5. Clinical Positive Affect Scale (CPAS) [A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3]

   The CPAS is a 16-item self-report scale to assess the level to which participants experience persistent distress due to feeling that they have not returned to their normal or premorbid state. Items (e.g., "I look forward to things") are rated on a 5-point scale (0=not at all, 1=very much less than normal, 2=much less than normal, 3=slightly less than normal, 4=same as best or normal self). The possible scale range is 0 to 64, with higher scores indicating greater recovery from depression. Patients were asked to rate their experience of the past 24 hours.

6. Snaith-Hamilton Pleasure-Scale (SHAPS) [A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3]

   The SHAPS is a 14-item self-report scale to measure hedonic tone. Items (e.g., "I would enjoy reading a book, magazine, or newspaper.") are rated on a 4-point scale (1=strongly disagree, 2=disagree, 3=agree, 4=strongly agree). Either of the 'disagree' responses scores 1 point, and either of the 'agree' responses scores 0 points, for a total scale range of 0-14. Higher scores indicate greater inability to experience pleasure. Patients were asked to rate their experience of the past 24 hours.

7. Clinician-Administered Dissociative States Scale (CADSS) Scores During Infusion [Day 0/baseline at 0, 40, 80, and 120 minutes]

   The CADSS is a 23-item self-report scale for the assessment of dissociative states. It is a reliable, valid self-report instrument. The severity of each dissociative symptom ranges from 0 (not present) to 4 (extreme). The total score is calculated by summing across items, with a total possible range of 0-92. The CADSS was administered right before infusion, and 40, 80 minute and 120 minutes after the start of infusion. The timeframe is "at this moment".

8. Number of Participants Reporting Suicidal Ideation/Behavior on the Columbia Suicide Severity Rating Scale (C-SSRS) [Screening Visit and Days 0, 1, 3, 5, 7, 14 and 30 combined]

   The Columbia Suicide Severity Rating Scale (C-SSRS): The C-SSRS is a low-burden measure of the spectrum of suicidal ideation and behavior that was developed in the National Institute of Mental Health Treatment of Adolescent Suicide Attempters Study to assess severity and track suicidal events through any treatment. It is a clinical interview providing a summary of both ideation and behavior that can be administered during any evaluation or risk assessment to identify the level and type of suicidality present. The C-SSRS can also be used during treatment to monitor for clinical worsening or improvement. It contains 5 rating scale questions (yes/no) for suicidal ideation increasing severity and 5 rating scale questions (yes/no) for suicidal behavior of increasing severity. The time frame is for both lifetime and the past six months for the Baseline/Screening scale and since the last visit for the Since Last Visit scale.

9. Number of Participants With Abnormal and Clinically Significant CBC and Chemistry Labs by Treatment [Day 3 and Early Termination Visit (approximately 3 weeks following intervention)]

   CBC Chemistry (Total bilirubin, AST, ALT, GGT, ALK Phosphatase, Creatinine, BUN/Urea, Glucose, Uric Acid) Testing was performed by study site laboratories and used institutional normal lab value ranges.

Eligibility Criteria

Criteria

• Ages Eligible for Study: 18 Years to 70 Years
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: No

Inclusion Criteria:

• Male or female, 18-70 years old.

• Able to read, understand, and provide written, dated informed consent prior to screening.

• Diagnosed with Major Depressive Disorder (MDD), single or recurrent, and currently experiencing a Major Depressive Episode (MDE) of at least eight weeks in duration, prior to screening.

• Has a history of TRD during the current MDE.

• Meet the threshold on the total MADRS score of greater than or equal to 20 at both screening and baseline visits (Day -7/-28 and Day 0), as confirmed by the remote centralized MGH CTNI rater between the screen visit and the baseline visit.

• In good general health

• For female participants, status of non-childbearing potential or use of an acceptable form of birth control

• Body mass index between 18-35 kg/m2

• Concurrent psychotherapy will be allowed if the type and frequency of the therapy has been stable for at least three months prior to screening and is expected to remain stable during participation in the study

• Concurrent hypnotic therapy will be allowed if the therapy has been stable for at least 4 weeks prior to screening and if it is expected to remain stable during the course of the subject's participation in the study.

Exclusion Criteria:

• Female of childbearing potential who is not willing to use one of the specified forms of birth control during the study

• Female that is pregnant or breastfeeding

• Female with a positive pregnancy test at screening or baseline

• History during the current MDE of failure to achieve a satisfactory response to >7 treatment courses of a therapeutic dose of an antidepressant therapy of at least 8 weeks duration during the current episode

• Total MADRS score of <20 at the screen or baseline visits, or as assessed by the remote, independent MGH CTNI rater and reported to the site

• Current diagnosis of a Substance Use Disorder (Abuse or Dependence) with the exception of nicotine dependence, at screening or within 6 months prior to screening

• Current Axis I disorder that is the principal focus of treatment and MDD the secondary focus of treatment for the past 6 months or more

• History of bipolar disorder, schizophrenia or schizoaffective disorders, or any history of psychotic symptoms in the current or previous depressive episodes

• History of eating disorders within five years of screening

• Any Axis I or Axis II Disorder, which at screening is clinically predominant to their MDD or has been predominant at any time within 6 months prior to screening

• Subject is considered at significant risk for suicidal behavior during the course of their participation in the study

• Has failed to respond to electroconvulsive therapy (ECT) during the current depressive episode

• Has received vagus nerve stimulation (VNS) at any time prior to screening

• Has dementia, delirium, amnestic, or any other cognitive disorder

• Has a clinically significant abnormality on the screening physical examination

• Participation in any clinical trial with an investigational drug or device within the past month or concurrent to study participation

• Current episode of:

1. Hypertension, Stage 1 as defined by a systolic blood pressure ≥140mmHg or diastolic blood pressure ≥90 mmHg at screening on two of three measurements (standing and supine) at least 15 minutes apart.

2. Hypertension, Stage 1 as defined by a systolic blood pressure ≥155 mmHg or diastolic blood pressure ≥99 mmHg at the Baseline Visit (Visit 1) within 1.5 hours prior to randomization on two of three measurements (standing and supine) at least 15 minutes apart.

3. Recent myocardial infarction (within one year) or a history of myocardial infarction.

4. Syncopal event within the past year.

5. Congestive heart failure (CHF) New York Heart Association Criteria >Stage 2

6. Angina pectoris.

7. Heart rate <50 or >105 beats per minute at screening or randomization (Baseline Visit).

8. QTcF (Fridericia-corrected) ≥450 msec at screening or randomization (Baseline Visit).

• Current history of hypertension, or on antihypertensives for the purpose of lowering blood pressure, who have either had an increase in antihypertensive dose or increase in the number of antihypertensive drugs used to treat hypertension over the last 2 months.

• Chronic lung disease excluding asthma.

• Lifetime history of surgical procedures involving the brain or meninges, encephalitis, meningitis, degenerative central nervous system disorder, epilepsy, mental retardation, or any other disease/procedure/accident/intervention associated with significant injury to or malfunction of the central nervous system, or a history of significant head trauma within the past 2 years

• Presents with any of the following lab abnormalities:

1. Thyroid stimulating hormone outside of the normal limits and clinically significant as determined by the investigator. Free thyroxine (T4) levels may be measured if TSH level is high. Subject will be excluded if T4 level is clinically significant.

2. Patients with diabetes mellitus fulfilling any of the following criteria:

1. Unstable diabetes mellitus defined as glycosylated hemoglobin (HbA1c) >8.5% at screening ii. Admitted to hospital for treatment of diabetes mellitus or diabetes mellitus related illness in the past 12 weeks iii. Not under physician care for diabetes mellitus iv. Has not been on the same dose of oral hypoglycaemic drug(s) and/or diet for the 4 weeks prior to screening. For thiazolidinediones (glitazones) this period should not be less than 8 weeks.

2. Any other clinically significant abnormal laboratory result (as determined after evaluation by study investigator and MGH CTNI medical monitor) at the time of the screening exam.

• History of hypothyroidism and has been on a stable dosage of thyroid replacement medication for less than 2 months prior to screening. (Subjects on a stable dosage of thyroid replacement medication for at least 2 months or more prior to screening are eligible for enrollment.)

• History of hyperthyroidism which was treated (medically or surgically) less than six months prior to screening

• Any current or past history of any physical condition which in the investigator's opinion might put the subject at risk or interfere with study results interpretation

• History of positive screening urine test for drugs of abuse at screening

• Patients with exclusionary laboratory values, or requiring treatment with exclusionary concomitant medications

• Patients on exclusionary concomitant psychotropic medications, the half-life of which would not allow sufficient time for patients to have been free of the medication post-taper for five half-lives within the maximum screening period (28 days).

• Patient who have participated in studies of ketamine or AZD6765 or other NMDA receptor antagonists for depression and received active treatment.

• Patients with narrow angle glaucoma

• Patients with a lifetime history of PCP/Ketamine drug use

• Liver Function Tests higher than 2.5 times upper limit of normal

Contacts and Locations

Locations

	Site	City	State	Country	Postal Code
1	Stanford University	Palo Alto	California	United States	94304
2	Yale University	New Haven	Connecticut	United States	06520
3	Massachusetts General Hospital	Boston	Massachusetts	United States	02114
4	Mount Sinai School of Medicine	New York	New York	United States	10029
5	University of Texas Southwestern	Dallas	Texas	United States	75390
6	Baylor College of Medicine	Houston	Texas	United States	77030

Sponsors and Collaborators

• Massachusetts General Hospital
• National Institute of Mental Health (NIMH)
• Baylor College of Medicine
• Icahn School of Medicine at Mount Sinai
• Stanford University
• University of Texas
• Yale University

Investigators

• Principal Investigator: Maurizio Fava, MD, Massachusetts General Hospital

Study Documents (Full-Text)

None provided.

More Information

Publications

• Bremner JD, Krystal JH, Putnam FW, Southwick SM, Marmar C, Charney DS, Mazure CM. Measurement of dissociative states with the Clinician-Administered Dissociative States Scale (CADSS). J Trauma Stress. 1998 Jan;11(1):125-36.
• Guy W, editor. ECDEU Assessment Manual for Psychopharmacology. Rockville, MD: US Department of Heath, Education, and Welfare Public Health Service Alcohol, Drug Abuse, and Mental Health Administration; 1976.
• HAMILTON M. A rating scale for depression. J Neurol Neurosurg Psychiatry. 1960 Feb;23:56-62.
• Hamilton M. Development of a rating scale for primary depressive illness. Br J Soc Clin Psychol. 1967 Dec;6(4):278-96.
• Montgomery SA, Asberg M. A new depression scale designed to be sensitive to change. Br J Psychiatry. 1979 Apr;134:382-9.
• Nierenberg AA, Bentley KH, Farabaugh AH, Fava M, Deckersbach T. The absence of depressive symptoms is not the presence of wellness: validation of the Clinical Positive Affect Scale. Aust N Z J Psychiatry. 2012 Dec;46(12):1165-72. doi: 10.1177/0004867412459810. Epub 2012 Sep 18.
• Posner K, Oquendo MA, Gould M, Stanley B, Davies M. Columbia Classification Algorithm of Suicide Assessment (C-CASA): classification of suicidal events in the FDA's pediatric suicidal risk analysis of antidepressants. Am J Psychiatry. 2007 Jul;164(7):1035-43.
• Snaith RP, Hamilton M, Morley S, Humayan A, Hargreaves D, Trigwell P. A scale for the assessment of hedonic tone the Snaith-Hamilton Pleasure Scale. Br J Psychiatry. 1995 Jul;167(1):99-103.

• Responsible Party: Maurizio Fava, MD, Overall Principal Investigator, Massachusetts General Hospital
• ClinicalTrials.gov Identifier: NCT01920555
• Other Study ID Numbers: RAP-003; 271201100006I-0-27100007-1
• First Posted: Aug 12, 2013
• Last Update Posted: Jun 19, 2018
• Last Verified: May 1, 2018

• Keywords provided by Maurizio Fava, MD, Overall Principal Investigator, Massachusetts General Hospital: Depression; Treatment Resistant Depression; Ketamine; Antidepressant; MDD; Major Depression
• Additional relevant MeSH terms: Depression; Depressive Disorder; Depressive Disorder, Treatment-Resistant; Midazolam; Ketamine

Study Results

Participant Flow

Pre-assignment Detail	The screening period served as a wash-out period for any prohibited medications that could be discontinued safely. Discontinuation of medications were discussed in consultation with the prescribing clinician.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam (Active Placebo)
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of midazolam - one single infusion Placebo Midazolam: Dose of Midazolam (active placebo) will be 0.045 mg/kg - one single infusion
Period Title: Overall Study
STARTED	18	20	22	20	19
COMPLETED	14	16	21	17	18
NOT COMPLETED	4	4	1	3	1

Baseline Characteristics

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam (Active Placebo)	Total
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of midazolam - one single infusion Placebo Midazolam: Dose of Midazolam (active placebo) will be 0.045 mg/kg - one single infusion	Total of all reporting groups
Overall Participants	18	20	22	20	19	99
Age (years) [Mean (Standard Deviation) ]
Mean (Standard Deviation) [years]	43.1 (11.9)	45.5 (14.6)	48.6 (12.9)	47.4 (10.1)	45.6 (13.8)	46.04 (12.64)
Sex: Female, Male (Count of Participants)
Female	10 55.6%	9 45%	11 50%	8 40%	11 57.9%	49 49.5%
Male	8 44.4%	11 55%	11 50%	12 60%	8 42.1%	50 50.5%
Ethnicity (NIH/OMB) (Count of Participants)
Hispanic or Latino	1 5.6%	0 0%	2 9.1%	0 0%	0 0%	3 3%
Not Hispanic or Latino	17 94.4%	20 100%	20 90.9%	20 100%	19 100%	96 97%
Unknown or Not Reported	0 0%	0 0%	0 0%	0 0%	0 0%	0 0%
BMI (kg/m^2) [Mean (Standard Deviation) ]
Mean (Standard Deviation) [kg/m^2]	25.2 (3.1)	24.9 (3.7)	25.3 (5.7)	26.1 (3.8)	26.3 (4.1)	24.96 (4.08)
Abnormal and Clinically Significant Labs (Count of Participants)
CBC	0 0%	0 0%	0 0%	0 0%	0 0%	0 0%
Chemistry	0 0%	0 0%	0 0%	0 0%	0 0%	0 0%
Hormonal Measures (testosterone, SHBG, Free T)	0 0%	2 10%	0 0%	0 0%	0 0%	2 2%
Hormonal Measures (DHEA)	0 0%	0 0%	0 0%	1 5%	0 0%	1 1%
Hormonal Measures (remaining tests)	0 0%	0 0%	0 0%	0 0%	0 0%	0 0%
Pregnancy Test	0 0%	0 0%	0 0%	0 0%	0 0%	0 0%
Urine Toxicology Screen	0 0%	0 0%	0 0%	0 0%	0 0%	0 0%

Outcome Measures

1. Primary Outcome

Title	Hamilton Rating Scale for Depression - 6 Items
Description	The HAMD6 is a 6-item clinician-rated scale, where clinicians rate the presence of depression symptoms (i.e., depressed mood, guilt, work and interests, psychomotor retardation, psychic anxiety, somatic symptoms) on a 5-point scale, where 0 = not present, and 1-4 represent increasingly severe symptoms. One item (i.e., somatic symptoms) is rated on only a 3-point scale, ranging from 0-2. The possible scale range is 0-22, where higher values represent more severe depression. This instrument is completed with a structured interview guide by the clinician based on his/her assessment of the patient's symptoms. This structured interview has been validated for use with time frames shorter than one week. In this study, the HAMD6 was used to assess symptoms occurring in the past 24 hours.
Time Frame	A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1, & 3

Outcome Measure Data

Analysis Population Description

Several subjects dropped out of the study in between Day 0, Day 1 and Day 3.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Day 0	12.5555556 (1.8221585)	12.7500000 (2.4894514)	12.5909091 (1.4690162)	12.6315789 (2.0872770)	13.0526316 (2.2967050)
Day 1	7.5000000 (4.3204938)	9.2631579 (3.6944719)	5.8636364 (4.4859087)	6.9000000 (4.5061362)	10.6666667 (3.3606722)
Day 3	6.8000000 (4.6167397)	8.4736842 (4.9818384)	5.9047619 (4.3000554)	7.2000000 (3.8196170)	9.0555556 (4.5435439)

Statistical Analysis 1

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.14
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-3.18
	Confidence Interval	(2-Sided) 95%; -5.93 to -0.43
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 2

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.79
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.13
	Confidence Interval	(2-Sided) 95%; -3.75 to 1.49
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 3

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	<0.01
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-4.79
	Confidence Interval	(2-Sided) 95%; -7.35 to -2.24
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 4

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.04
	Comments
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-3.76
	Confidence Interval	(2-Sided) 95%; -6.37 to -1.15
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 5

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.72
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-2.04
	Confidence Interval	(2-Sided) 95%; -5.04 to 0.95
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 6

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.80
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.36
	Confidence Interval	(2-Sided) 95%; -3.18 to 2.46
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 7

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.14
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-3.12
	Confidence Interval	(2-Sided) 95%; -5.97 to -0.44
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 8

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.72
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.84
	Confidence Interval	(2-Sided) 95%; -4.65 to 0.96
	Parameter Dispersion	Type: Value:
	Estimation Comments

2. Secondary Outcome

Title	Montgomery-Asberg Depression Rating Scale (MADRS)
Description	The MADRS is a 10-item clinician-rated scale measuring depression severity. Symptoms are rated on a 7-point scale, where 0 = "not present", and 1-6 represent increasing severity. Values 2, 4, and 6 have specific anchoring text (e.g., 2="Difficulties in starting activities." 4="Difficulties in starting simple routine activities which are carried out with effort, 6="Complete lassitude. Unable to do anything without help.") Values 1, 3, and 5 do not have specific text. The possible scale range is 0-60, where higher values represent higher severity. In this study, the MADRS was used to rate symptoms occurring in the past 3 days.
Time Frame	A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0 and 3.

Outcome Measure Data

Analysis Population Description

Several subjects dropped out of the study in between Day 0, Day 1 and Day 3.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Day 0	33.8333333 (5.9334545)	34.4500000 (8.4571676)	31.5909091 (3.9359042)	32.6500000 (5.8873191)	33.6315789 (7.0884141)
Day 3	19.6666667 (10.8144524)	22.6315789 (11.7294052)	14.7619048 (8.9883523)	17.1000000 (11.5708345)	24.8333333 (10.5286723)

Statistical Analysis 1

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were four pairwise comparisons of interest (see Analysis 1-4), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.33
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-5.15
	Confidence Interval	(2-Sided) 95%; -12.44 to 2.14
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 2

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were four pairwise comparisons of interest (see Analysis 1-4), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.53
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-2.16
	Confidence Interval	(2-Sided) 95%; -9.03 to 4.72
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 3

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were four pairwise comparisons of interest (see Analysis 1-4), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.02
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-9.85
	Confidence Interval	(2-Sided) 95%; -16.56 to -3.15
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 4

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were four pairwise comparisons of interest (see Analysis 1-4), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.08
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-7.72
	Confidence Interval	(2-Sided) 95%; -14.52 to -0.93
	Parameter Dispersion	Type: Value:
	Estimation Comments

3. Secondary Outcome

Title	Clinical Global Impressions-Severity (CGI-S)
Description	The CGI-S is a clinician rated single-item scale: "How depressed is the patient at this time?", rated on a 7-point response scale: 1 = Normal, not at all depressed, 2 = Borderline depressed, 3 = Mildly depressed, 4 = Moderately depressed. 5 = Markedly depressed, 6 = severely depressed, 7 = Among the most severely depressed patients. When rating patients, clinicians were asked to consider the past 24 hours.
Time Frame	A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3

Outcome Measure Data

Analysis Population Description

Several subjects dropped out of the study in between Day 0, Day 1 and Day 3.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Day 0	5.0000000 (0.7669650)	5.2000000 (0.6958524)	4.8636364 (0.6396021)	5.2000000 (0.7677719)	5.000000 (0.7453560)
Day 1	3.5625000 (1.4591664)	4.2631579 (1.2401660)	3.2727273 (1.2792043)	3.5000000 (1.1002392)	4.555556 (0.7838234)
Day 3	3.4000000 (1.6388149)	3.7368421 (1.4848159)	3.1428571 (1.3887301)	3.3000000 (1.4545754)	4.1666667 (1.3394468)

Statistical Analysis 1

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.08
	Comments
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.03
	Confidence Interval	(2-Sided) 95%; -1.83 to -0.22
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 2

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.82
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.26
	Confidence Interval	(2-Sided) 95%; -1.02 to 0.51
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 3

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.00720
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.28
	Confidence Interval	(2-Sided) 95%; -2.02 to -0.54
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 4

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.04884
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.05
	Confidence Interval	(2-Sided) 95%; -1.81 to -0.29
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 5

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.48
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.71
	Confidence Interval	(2-Sided) 95%; -1.70 to 0.28
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 6

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.82
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.39
	Confidence Interval	(2-Sided) 95%; -1.32 to 0.55
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 7

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.16
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.00
	Confidence Interval	(2-Sided) 95%; -1.91 to -0.09
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 8

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.27
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.86
	Confidence Interval	(2-Sided) 95%; -1.78 to 0.07
	Parameter Dispersion	Type: Value:
	Estimation Comments

4. Secondary Outcome

Title	Clinical Global Impressions-Improvement (CGI-I) Scale
Description	The CGI-I is a clinician rated single-item scale: "Compared to the patient's condition at admission, how much has the patient changed?", rated on a 7-point response scale: 1 = Very much improved, 2 = Much improved, 3 = Minimally improved, 4 = No change, 5 = Minimally worse, 6 = Much worse, and 7 = Very much worse. In this case, "admission" referred to the CGI-S screening assessments performed between Day -28 an -7, one conducted during the screening visit, and a second rating conducted by a remote, independent rater.
Time Frame	A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3

Outcome Measure Data

Analysis Population Description

Several subjects dropped out of the study in between Day 0, Day 1 and Day 3.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Day 0	3.8888889 (0.3233808)	4.0500000 (0.2236068)	4.1363636 (0.7101613)	4.0000000 (0.4588315)	4.1578947 (0.6021404)
Day 1	3.0625000 (1.4361407)	3.3684211 (1.0651305)	2.6363636 (0.9021379)	3.0500000 (1.2343760)	3.6111111 (0.6076850)
Day 3	2.9333333 (1.2798809)	2.8421053 (1.2588865)	2.5714286 (0.9258201)	2.5500000 (1.0990426)	3.1666667 (1.0431852)

Statistical Analysis 1

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.54
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Net)
	Estimated Value	-0.54
	Confidence Interval	(2-Sided) 95%; -1.25 to 0.17
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 2

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.10
	Confidence Interval	(2-Sided) 95%; -0.78 to 0.58
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 3

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.03
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.98
	Confidence Interval	(2-Sided) 95%; -1.64 to -0.31
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 4

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.54
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.56
	Confidence Interval	(2-Sided) 95%; -1.24 to 0.11
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 5

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.19
	Confidence Interval	(2-Sided) 95%; -0.96 to 0.57
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 6

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.21
	Confidence Interval	(2-Sided) 95%; -0.93 to 0.51
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 7

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.52
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.64
	Confidence Interval	(2-Sided) 95%; -1.35 to 0.06
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 8

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.54
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.62
	Confidence Interval	(2-Sided) 95%; -1.33 to 0.10
	Parameter Dispersion	Type: Value:
	Estimation Comments

5. Secondary Outcome

Title	Symptoms of Depression Questionnaire (SDQ)
Description	The SDQ is a 44-item self-report scale, which aims to measure depression more comprehensively by including the assessment of symptoms in the anxiety-depression spectrum, including symptoms of irritability, anger attacks, and anxiety. Items are rated on an 6-point Likert scale, where participants are asked to rate if a specific symptom (e.g. "How has your mood been over the past 24 hours?") is normal for him or her (score = 2), what is better than normal (score = 1), and what is worse than normal (scores = 3-6). The total scale score is calculated by averaging across the items, resulting in a possible range from 1 to 6. Higher scores indicate greater depression severity. When rating, patients were asked to consider their symptoms during the past 24 hours.
Time Frame	A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3

Outcome Measure Data

Analysis Population Description

Several subjects dropped out of the study in between Day 0, Day 1 and Day 3.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Day 0	3.5164141 (0.5081856)	3.4636364 (0.5416735)	3.5392562 (0.5838397)	3.4113636 (0.4336652)	3.4264507 (0.4719770)
Day 1	2.5752843 (0.7091841)	2.9096195 (0.7123910)	2.3109504 (0.6315677)	2.6113636 (0.500567)	2.9200573 (0.6464210)
Day 3	2.5106061 (0.7158120)	2.7828283 (0.7398734)	2.5573593 (0.9017779)	2.5909091 (0.5736341)	2.8751353 (0.6668931)

Statistical Analysis 1

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.74
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.35
	Confidence Interval	(2-Sided) 95%; -0.79 to 0.08
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 2

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	0.04
	Confidence Interval	(2-Sided) 95%; -0.37 to 0.45
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 3

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.02
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.61
	Confidence Interval	(2-Sided) 95%; -1.01 to -0.21
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 4

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.80
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.31
	Confidence Interval	(2-Sided) 95%; -0.72 to 0.10
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 5

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.88
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.33
	Confidence Interval	(2-Sided) 95%; -0.83 to 0.18
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 6

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.05
	Confidence Interval	(2-Sided) 95%; -0.53 to 0.44
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 7

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.88
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.32
	Confidence Interval	(2-Sided) 95%; -0.79 to 0.15
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 8

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.88
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.29
	Confidence Interval	(2-Sided) 95%; -0.76 to 0.19
	Parameter Dispersion	Type: Value:
	Estimation Comments

6. Secondary Outcome

Title	Clinical Positive Affect Scale (CPAS)
Description	The CPAS is a 16-item self-report scale to assess the level to which participants experience persistent distress due to feeling that they have not returned to their normal or premorbid state. Items (e.g., "I look forward to things") are rated on a 5-point scale (0=not at all, 1=very much less than normal, 2=much less than normal, 3=slightly less than normal, 4=same as best or normal self). The possible scale range is 0 to 64, with higher scores indicating greater recovery from depression. Patients were asked to rate their experience of the past 24 hours.
Time Frame	A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3

Outcome Measure Data

Analysis Population Description

Several subjects dropped out of the study in between Day 0, Day 1 and Day 3.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Day 0	19.3333333 (12.1896774)	20.5000000 (15.4357753)	20.6363636 (11.7008158)	21.2500000 (14.6785737)	21.2631579 (12.1052886)
Day 1	35.2500000 (20.9936498)	27.0526316 (18.8516833)	40.8696964 (19.5284785)	33.0000000 (16.2642650)	24.4444444 (15.2053482)
Day 3	38.8666667 (22.8666667)	28.3888889 (20.2459550)	39.7619048 (22.5319878)	37.4500000 (18.7096232)	33.3750000 (15.8445574)

Statistical Analysis 1

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.49
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	11.18
	Confidence Interval	(2-Sided) 95%; -0.94 to 23.29
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 2

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	1.37
	Confidence Interval	(2-Sided) 95%; -10.19 to 12.93
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 3

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.03
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	16.54
	Confidence Interval	(2-Sided) 95%; 5.31 to 27.77
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 4

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.82
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	8.68
	Confidence Interval	(2-Sided) 95%; -2.81 to 20.16
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 5

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	5.11
	Confidence Interval	(2-Sided) 95%; -8.83 to 19.05
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 6

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-6.64
	Confidence Interval	(2-Sided) 95%; -19.87 to 6.59
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 7

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	7.64
	Confidence Interval	(2-Sided) 95%; -5.26 to 20.53
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 8

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	4.80
	Confidence Interval	(2-Sided) 95%; -8.31 to 17.91
	Parameter Dispersion	Type: Value:
	Estimation Comments

7. Secondary Outcome

Title	Snaith-Hamilton Pleasure-Scale (SHAPS)
Description	The SHAPS is a 14-item self-report scale to measure hedonic tone. Items (e.g., "I would enjoy reading a book, magazine, or newspaper.") are rated on a 4-point scale (1=strongly disagree, 2=disagree, 3=agree, 4=strongly agree). Either of the 'disagree' responses scores 1 point, and either of the 'agree' responses scores 0 points, for a total scale range of 0-14. Higher scores indicate greater inability to experience pleasure. Patients were asked to rate their experience of the past 24 hours.
Time Frame	A baseline assessment was made on Day 0, preceding infusion (i.e., treatment). Outcome assessments were made on days 1, 3, 5, 7, 14, and 30. The primary endpoint for this study was Day 3. Thus, the outcome measure table provides data on Days 0, 1 and 3

Outcome Measure Data

Analysis Population Description

Several subjects dropped out of the study in between Day 0, Day 1 and Day 3.

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Day 0	7.2222222 (3.9040786)	7.5500000 (3.9132030)	6.5909091 (3.2316749)	7.3500000 (4.1961762)	6.4736842 (3.7471237)
Day 1	3.9375000 (4.2812576)	5.7368421 (4.2536534)	2.22727273 (3.5748036)	4.3000000 (4.5664682)	5.0000000 (4.6272848)
Day 3	3.5333333 (3.3777987)	6.3888889 (4.5262488)	3.0000000 (3.7815341)	3.6500000 (4.8370826)	4.2500000 (3.8384024)

Statistical Analysis 1

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.21
	Confidence Interval	(2-Sided) 95%; -3.99 to 1.56
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 2

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.17
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	0.76
	Confidence Interval	(2-Sided) 95%; -1.90 to 3.43
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 3

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.30
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-2.74
	Confidence Interval	(2-Sided) 95%; -5.32 to -0.16
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 4

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 1: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.71
	Confidence Interval	(2-Sided) 95%; -3.35 to 1.93
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 5

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.1 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.29
	Confidence Interval	(2-Sided) 95%; -3.25 to 2.66
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 6

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.2 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	0.39
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	2.76
	Confidence Interval	(2-Sided) 95%; -0.06 to 5.59
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 7

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 0.5 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-1.17
	Confidence Interval	(2-Sided) 95%; -3.91 to 1.58
	Parameter Dispersion	Type: Value:
	Estimation Comments

Statistical Analysis 8

Statistical Analysis Overview	Comparison Group Selection	Ketamine 0.1mg, Ketamine 0.2mg, Ketamine 0.5mg, Ketamine 1.0mg, Midazolam 0.045mg
	Comments	Ketamine 1.0 mg/kg vs. midazolam at Day 3: As estimated by the repeated measures fixed effects model with DAY (0, 1, 3), GROUP (5 groups as specified above), and the DAY*GROUP interaction effect. Because there were eight pairwise comparisons of interest (see Analysis 1-8), we used Holm's method to protect family-wise error rate in the presence of multiple testing.
	Type of Statistical Test	Superiority
	Comments
Statistical Test of Hypothesis	p-Value	1.00
	Comments	Holm's method was applied to the model-produced differences of least squares for the eight a priori identified contrasts of interest, that is, the difference between each ketamine group vs. placebo at Days 1 and 3.
	Method	Mixed Models Analysis
	Comments
Method of Estimation	Estimation Parameter	Mean Difference (Final Values)
	Estimated Value	-0.43
	Confidence Interval	(2-Sided) 95%; -3.22 to 2.35
	Parameter Dispersion	Type: Value:
	Estimation Comments

8. Secondary Outcome

Title	Clinician-Administered Dissociative States Scale (CADSS) Scores During Infusion
Description	The CADSS is a 23-item self-report scale for the assessment of dissociative states. It is a reliable, valid self-report instrument. The severity of each dissociative symptom ranges from 0 (not present) to 4 (extreme). The total score is calculated by summing across items, with a total possible range of 0-92. The CADSS was administered right before infusion, and 40, 80 minute and 120 minutes after the start of infusion. The timeframe is "at this moment".
Time Frame	Day 0/baseline at 0, 40, 80, and 120 minutes

Outcome Measure Data

Analysis Population Description

[Not Specified]

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Minute 0	0.1111111 (0.4714045)	0.1000000 (0.4472136)	0 (0)	0.1000000 (0.3077935)	0.4210526 (1.01739326)
Minute 40	3.0000000 (5.0758946)	4.0500000 (4.2608993)	14.2727273 (9.6076644)	24.6842105 (17.7108022)	2.6842105 (3.5127171)
Minute 80	0.4444444 (0.7838234)	0.1000000 (0.4472136)	0.7727273 (2.1141658)	1.8000000 (2.9664794)	1.1578947 (1.8337320)
Minute 120	0.0555556 (0.2357023)	0 (0)	0.1363636 (0.6396021)	0.6500000 (1.5985191)	0.5789474 (0.9015905)

9. Secondary Outcome

Title	Number of Participants Reporting Suicidal Ideation/Behavior on the Columbia Suicide Severity Rating Scale (C-SSRS)
Description	The Columbia Suicide Severity Rating Scale (C-SSRS): The C-SSRS is a low-burden measure of the spectrum of suicidal ideation and behavior that was developed in the National Institute of Mental Health Treatment of Adolescent Suicide Attempters Study to assess severity and track suicidal events through any treatment. It is a clinical interview providing a summary of both ideation and behavior that can be administered during any evaluation or risk assessment to identify the level and type of suicidality present. The C-SSRS can also be used during treatment to monitor for clinical worsening or improvement. It contains 5 rating scale questions (yes/no) for suicidal ideation increasing severity and 5 rating scale questions (yes/no) for suicidal behavior of increasing severity. The time frame is for both lifetime and the past six months for the Baseline/Screening scale and since the last visit for the Since Last Visit scale.
Time Frame	Screening Visit and Days 0, 1, 3, 5, 7, 14 and 30 combined

Outcome Measure Data

Analysis Population Description

[Not Specified]

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Screening: # with suicidal ideation/behavior	17 94.4%	15 75%	17 77.3%	14 70%	17 89.5%
Follow-Up: # with suicidal ideation/behavior	15 83.3%	9 45%	10 45.5%	6 30%	13 68.4%

10. Secondary Outcome

Title	Number of Participants With Abnormal and Clinically Significant CBC and Chemistry Labs by Treatment
Description	CBC Chemistry (Total bilirubin, AST, ALT, GGT, ALK Phosphatase, Creatinine, BUN/Urea, Glucose, Uric Acid) Testing was performed by study site laboratories and used institutional normal lab value ranges.
Time Frame	Day 3 and Early Termination Visit (approximately 3 weeks following intervention)

Outcome Measure Data

Analysis Population Description

[Not Specified]

Arm/Group Title	Ketamine 0.1mg	Ketamine 0.2mg	Ketamine 0.5mg	Ketamine 1.0mg	Midazolam 0.045mg
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion	Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion	Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion	Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion	Patients in this arm will receive 0.045 mg/kg of Midazolam (active placebo) - one single infusion
Measure Participants	18	20	22	20	19
Chemistry ALT(SGPT)	0 0%	1 5%	0 0%	0 0%	0 0%
Chemistry AST(SGOT)	0 0%	1 5%	0 0%	0 0%	0 0%
Chemistry Total Bilirubin	0 0%	1 5%	0 0%	0 0%	0 0%
Chemistry Remaining Tests	0 0%	0 0%	0 0%	0 0%	0 0%
CBC	0 0%	0 0%	0 0%	0 0%	0 0%

Adverse Events

Time Frame	Number of patients with adverse events post infusion (treatment) up to 30 days.
Arm/Group Title	Ketamine 0.1mg		Ketamine 0.2mg		Ketamine 0.5mg		Ketamine 1.0mg		Midazolam (Active Placebo)
Arm/Group Description	Patients in this arm will receive 0.1 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.1 mg/kg - one single infusion		Patients in this arm will receive 0.2 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.2 mg/kg - one single infusion		Patients in this arm will receive 0.5 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 0.5 mg/kg - one single infusion		Patients in this arm will receive 1.0 mg/kg of Ketamine - one single infusion Ketamine: Dose of Ketamine will be 1.0 mg/kg - one single infusion		Patients in this arm will receive 0.045 mg/kg of midazolam - one single infusion Placebo Midazolam: Dose of Midazolam (active placebo) will be 0.045 mg/kg - one single infusion
All Cause Mortality
	Ketamine 0.1mg		Ketamine 0.2mg		Ketamine 0.5mg		Ketamine 1.0mg		Midazolam (Active Placebo)
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	0/18 (0%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Serious Adverse Events
	Ketamine 0.1mg		Ketamine 0.2mg		Ketamine 0.5mg		Ketamine 1.0mg		Midazolam (Active Placebo)
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Psychiatric disorders
Suicide Attempt	0/18 (0%)	0	1/20 (5%)	1	0/22 (0%)	0	0/20 (0%)	0	0/19 (0%)	0
Other (Not Including Serious) Adverse Events
	Ketamine 0.1mg		Ketamine 0.2mg		Ketamine 0.5mg		Ketamine 1.0mg		Midazolam (Active Placebo)
	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events	Affected / at Risk (%)	# Events
Total	17/18 (94.4%)		18/20 (90%)		14/22 (63.6%)		17/20 (85%)		10/19 (52.6%)
Blood and lymphatic system disorders
White Blood Cell Count Decreased	1/18 (5.6%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Cardiac disorders
Blood Pressure Increase	0/18 (0%)		0/20 (0%)		0/22 (0%)		2/20 (10%)		0/19 (0%)
Tachycardia	0/18 (0%)		1/20 (5%)		0/22 (0%)		1/20 (5%)		0/19 (0%)
Hypertension	0/18 (0%)		0/20 (0%)		0/22 (0%)		1/20 (5%)		0/19 (0%)
Gastrointestinal disorders
Nausea	2/18 (11.1%)		0/20 (0%)		3/22 (13.6%)		3/20 (15%)		0/19 (0%)
Vomiting	1/18 (5.6%)		1/20 (5%)		1/22 (4.5%)		1/20 (5%)		0/19 (0%)
Dyspepsia	0/18 (0%)		2/20 (10%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Diarrhea	1/18 (5.6%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)
Increased Appetite	1/18 (5.6%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
General disorders
Dizziness	0/18 (0%)		0/20 (0%)		0/22 (0%)		1/20 (5%)		0/19 (0%)
Presyncope	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Hepatobiliary disorders
Hepatic Enzyme Increased	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Infections and infestations
Tooth Abscess	0/18 (0%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)
Gastroenteritis Viral	0/18 (0%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		1/19 (5.3%)
Respiratory Tract Infection	0/18 (0%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)
Sinusitis	0/18 (0%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		1/19 (5.3%)
Upper Respiratory Tract Infection	0/18 (0%)		0/20 (0%)		0/22 (0%)		1/20 (5%)		0/19 (0%)
Viral Upper Respiratory Tract Infection	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Injury, poisoning and procedural complications
Exposure to Toxic Agent	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Fall	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Musculoskeletal and connective tissue disorders
Back Pain	1/18 (5.6%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		1/19 (5.3%)
Pain In Extremity	1/18 (5.6%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)
Arthralgia	0/18 (0%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		1/19 (5.3%)
Nervous system disorders
Headache	3/18 (16.7%)		2/20 (10%)		1/22 (4.5%)		3/20 (15%)		0/19 (0%)
Asthenia	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Loss of Consciousness	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Psychiatric disorders
Depression	1/18 (5.6%)		1/20 (5%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)
Abnormal Dreams	0/18 (0%)		0/20 (0%)		0/22 (0%)		1/20 (5%)		1/19 (5.3%)
Insomnia	1/18 (5.6%)		0/20 (0%)		0/22 (0%)		1/20 (5%)		0/19 (0%)
Poor Quality Sleep	1/18 (5.6%)		0/20 (0%)		0/22 (0%)		1/20 (5%)		0/19 (0%)
Suicidal Ideation	1/18 (5.6%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)
Dissociation	0/18 (0%)		0/20 (0%)		0/22 (0%)		1/20 (5%)		0/19 (0%)
Initial Insomnia	0/18 (0%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		1/19 (5.3%)
Intentional Self-Injury	0/18 (0%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		1/19 (5.3%)
Malaise	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Overdose	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Self Injurious Behavior	0/18 (0%)	0	0/20 (0%)	0	0/22 (0%)	0	0/20 (0%)	0	1/19 (5.3%)	1
Reproductive system and breast disorders
Blood Testosterone	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Respiratory, thoracic and mediastinal disorders
Nasal Congestion	0/18 (0%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		1/19 (5.3%)
Cough	0/18 (0%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)
Skin and subcutaneous tissue disorders
Dermatitis	0/18 (0%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		1/19 (5.3%)
Dermatitis Contact	0/18 (0%)		1/20 (5%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Vascular disorders
Flushing	1/18 (5.6%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Hot Flush	1/18 (5.6%)		0/20 (0%)		0/22 (0%)		0/20 (0%)		0/19 (0%)
Vertigo	0/18 (0%)		0/20 (0%)		1/22 (4.5%)		0/20 (0%)		0/19 (0%)

Limitations/Caveats

[Not Specified]

More Information

Certain Agreements

Principal Investigators are NOT employed by the organization sponsoring the study.

There is NOT an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.