HIHS: Housing, Insulation and Health Study

Sponsor

University of Otago (Other)

Overall Status

Completed

CT.gov ID

NCT00437541

Collaborator

(none)

4,000

Enrollment

Locations

Duration (Months)

500

Patients Per Site

29.4

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

In six communities we will seek out households where someone who has a history of respiratory problems. For the first winter we will measure temperature and humidity of the house and health of occupants. We will insulate half the houses and the next winter compare them with the uninsulated houses to see if warmer houses improve health.

Condition or Disease	Intervention/Treatment	Phase
Respiratory Illness Asthma	Device: Insulation retrofitted into house	N/A

Detailed Description

Damp, cold indoor environments are bad for the health of people who live in them, particularly if they have respiratory problems or are vulnerable, such as the young or the very old. This is a community based study designed to test the hypothesis that insulating domestic houses will make them warmer and that this increase in indoor temperature will improve their health and wellbeing.

Following two pilot studies, the first among older people in city council flats and the second among home owners in Waitara. We have followed the "Waitara model" where community networks will be mobilised to identify households in each community where there is someone with a on going respiratory problem. Seven communities have been selected to help test these hypotheses and have agreed to participate Otara, Gisborne, Mahia/Nuhaka, Taranaki, Porirua, West Coast and Christchurch. Low income areas with high Maori populations have been deliberately selected to maximise the potential health gains.

Two hundred houses in each community will be insulated free of charge to the occupants. The workers who will insulate the homes will be local people employed through the Department of Work and Income (WINZ).

Once the houesholds are selected they will be randomly assigned to intervention or control groups. During the first winter, all 1400 households will be monitored for temperature and humidity and their comfort, health and healthcare utilization will be recorded. Half the households, assigned to the intervention group, will be fully insulated during the spring. The following winter, all the initial measurements taken from both the intervention and control group will be repeated. At the end of the study period, all control houses will be insulated.

This study has developed from a natural intervention being carried out by the Energy Efficiency Conservation Authority (EECA) to insulate domestic houses in New Zealand and is a major collaborative effort, which will shed light on the effectiveness of insulation in improving health and wellbeing. The impact of housing refurbishment on health has not previously been examined. There is considerable government and policy interest in promoting healthy housing and there is strong community interest in ensuring the housing stock is improved in order to lower health risks.

Study Design

Study Type:

Interventional

Allocation:

Randomized

Intervention Model:

Parallel Assignment

Masking:

None (Open Label)

Primary Purpose:

Prevention

Official Title:

The Impact of Insulating Domestic Houses on the Health of Occupants: an Intervention Study

Study Start Date :

Jul 1, 2001

Study Completion Date :

Dec 1, 2002

Outcome Measures

Primary Outcome Measures

Self reported general health, During the first winter post intervention []
Indoor temperature and relative humidity, During the first winter post intervention []

Secondary Outcome Measures

Energy consumption, During the first winter post intervention []
Wheezing, During the first winter post intervention []
Days off school and work, During the first winter post intervention []
GP visits, During the first winter post intervention []
Inpatient hospital admissions, During the first winter post intervention []

Eligibility Criteria

Criteria

Ages Eligible for Study:

N/A and Older

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Inclusion Criteria:

Live in Study area
At least one person in the household must had had respiratory illness within the last year, well members of the same household may also participate
house currently uninsulated
interested in taking part in research

Exclusion Criteria:

Intending to move within study period

Contacts and Locations

Locations

	Site	City	State	Country
1	Otara Health Inc	Otara	Auckland	New Zealand
2	Te Iwi O Rakaipaaka	Mahia/Nuhaka	East Coast	New Zealand
3	Te Wahine O Kahungungu	Mahia/Nuhaka	East Coast	New Zealand
4	Opotiki Trade Training	Opotiki	Gisborne	New Zealand
5	Te Puni Kokiri	New Plymouth	Taranaki	New Zealand
6	Porirua Housing Action Group	Porirua	Wellington	New Zealand
7	Maori Womans Welfare League	Rata - Hokitika	West Coast	New Zealand
8	Crown Public Health	Christchurch		New Zealand