Social class and psychiatric disorder. The examination of an extreme.

Relationships between social status and various aspects of mental disorder have been of long-standing interest to both clinicians and researchers, and a large body of literature exists attesting to the importance of social status in understanding psychiatric illness and disability. Reports examining social status and schizophrenia suggest that relationships between socioeconomic status and psychiatric illness may rest heavily upon differences between the lowest socioeconomic stratum and the remainder of society. To investigate the extent to which relationships between socioeconomic status and psychiatric illness and disability reflect differences between a deviant lowest socioeconomic stratum and the remainder of society, data from 217 patients hospitalized for psychiatric disorder and reassessed at a 2-year follow-up were examined. At initial assessment, 17 patient characteristics were found to be associated with socioeconomic status; for seven of these 17 characteristics, the largest difference between classes was found between the lowest and the adjacent (next-lowest) social class. At follow-up, for five of 15 characteristics found to be related to social class, the greatest interclass difference occurred between the lowest and the adjacent social class. Both initially and at follow-up, significant associations between patient characteristics and social class remained when the lowest social class patients were excluded from the analyses.