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Eighty areas (160 municipalities, including the 15 biggest towns) in Finland; 2000–4.
8028 people aged over 30 years randomly selected using a two-stage stratified cluster sampling procedure to be nationally representative.
Initial screening for psychotic disorders consisted of a health examination and interview using the Composite International Diagnostic Interview (CIDI) in 2000–1. People meeting any of the following criteria were selected for diagnostic confirmation: physician or self-reported possible or definite psychotic disorder; lifetime episode of elevated mood lasting at least 4 days plus at least three manic symptoms (CIDI section F); any clinically relevant positive psychotic symptom or at least three lifetime positive psychotic symptoms (CIDI …
For correspondence: Jonna Perälä, MD, Department of Mental Health and Alcohol Research, National Public Health Institute, Mannerheimintie 166, 00300, Helsinki, Finland;
Sources of funding: Academy of Finland, the Stanley Medical Research Institute and the Yrjö Jahnsson Foundation.
Competing interests: Dr Altindag has been reimbursed by several drug companies, such as Pfizer, Eli Lilly, Astra-Zeneca, Wyett, for attending several conferences.
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