Objective: To describe the methodology of a province-wide, cross-sectional, epidemiologic study of psychiatric disorder among those aged 15 years and over living in household dwellings in Ontario. Method: Respondents for the survey were drawn from households (N = 13 002) participating in a province-wide health survey. One person per household was selected, and 9953 (76.5%) participated. Results: Participants and nonparticipants were similar to each other. An extensive array of data, including measures of psychiatric disorder classified using a revised version of the Composite International Diagnostic Interview (CIDI), are available for all respondents. Conclusions: The Ontario Health Supplement is contained in a public-use data file at the Ontario Ministry of Health and is available to investigators for study. A strong survey design, careful measurement, and acceptable levels of response provide the rationale for our inviting researchers to access and use the Ontario Health Supplement data base. (Can J Psychiatry 1996;41:549–558) Key Words: surveys, psychiatric disorder, methodology In 1987, the Ministry of Health of the province of Ontario proposed that a comprehensive population health survey b
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