Schizophrenia in Denmark. Incidence and utilization of psychiatric institutions.

All first admitted in 1972 to Danish psychiatric institutions diagnosed schizophrenics at least once until September 1983 (310 males and 277 females) are followed up. The incidence of schizophrenics diagnosed at their first admission is 7.8 males and 3.4 females/100,000 inhabitants and when those diagnosed as schizophrenics only at a later admission are included the incidence is correspondingly 15.0 and 8.7. The number of in-patient days is highest in the first year and stabilizes at a lower level in the last 7 to 8 years of the follow-up. The patients spent proportionately more days in mental hospitals than in psychiatric departments in general hospitals. Hebephrenic schizophrenics predominate in mental hospitals. Schizophrenics diagnosed during their first admission spent 19.5% of the 10-year follow-up period in institutions, while schizophrenics diagnosed during a later admission spent 17.4% (NS). Males spent 19.7% of the 10-year follow-up period in institutions, females 16.0% (P less than 0.05).