Lifetime Prevalence of Psychotic and Bipolar I Disorders in a General Population

To provide reliable estimates of the lifetime prevalences of specific psychotic disorders.

General population survey. SETTING AND PARTICIPANTS: A nationally representative sample of 8028 persons 30 years or older was screened for psychotic and bipolar I disorders using the Composite International Diagnostic Interview, self-reported diagnoses, medical examination, and national registers. Those selected by the screens were then re-interviewed with the Structured Clinical Interview for DSM-IV. Best-estimate DSM-IV diagnoses were formed by combining the interview and case note data. Register diagnoses were used to estimate the effect of the nonresponders. MAIN OUTCOME MEASURES: Diagnosis of any psychotic or bipolar I disorder according to the DSM-IV criteria.