Prevalence of severe mental disorders in disaffiliated and homeless people in inner Melbourne.

The authors determined the prevalence of mental illness in 382 people representative of the occupants of shelters for the homeless and cheap single-room accommodations in inner-city areas of Melbourne. Clinicians were trained to use a standardized diagnostic instrument, the Structured Clinical Interview for DSM-III-R, to diagnose a range of severe mental disorders, including psychotic, affective, and substance-related disorders. Almost half the people interviewed received diagnoses of current disorders, and over 70% received lifetime diagnoses. There was considerable comorbidity. Many factors are likely to contribute to the concentration of people with mental disorders in such homeless and disaffiliated groups.