The dynamics of hospitalization in a defined population during deinstitutionalization.

In a sample of 1,032 psychiatric inpatients studied for 1 year, chronic patients (more than 6 months' inpatient stay) represented 17.4%, almost half of whom were discharged during a 2-year follow-up; an additional 19.4% died. The incidence of "new" long-stay patients was 8.6/100,000 population, which, if constant over time, would result in a net increase of long-stay patients. Most chronic long-stay patients had a diagnosis of schizophrenia or organic brain syndrome. The two diagnostic groups had strikingly different patterns of deinstitutionalization. Alcoholic patients and those with "other" diagnoses demonstrated chronic dependence on the hospital, characterized by short inpatient stays and high readmission rates.