Estimated Prevalence of the Seasonal Subtype of Major Depression in a Canadian Community Sample

OBJECTIVE: To examine estimates of lifetime prevalence of seasonal affective disorder (SAD) in Toronto, Ontario. METHOD: Random telephone numbers were generated for the city of Toronto, and 781 respondents completed a telephone interview. Trained nonphysician interviewers conducted all interviews, which involved structured questions for diagnosing major depression. Patterns of symptom change across seasons were evaluated to establish a …