Prevalence of schizophrenia in an urban population.

The treated one-year prevalence and point-prevalence of schizophrenia, schizoaffective psychosis, and paranoid state in the city of Salford were derived from the Salford Psychiatric Case Register. The high rates found are attributed primarily to the effects of selective migration from the area. A breakdown of the use of health services in the area by patients with these diagnoses is given; hospital care was found to be the major form of treatment.