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The avowed intent of Dr. Dunham's Detroit study was "to determine if there are significant rate differences in the incidence of schizophrenia in various community and social class structures within the city." To this end two contrasting city subcommunities were chosen for investigation. One area was chosen from a group of districts having a high rate of first admissions for schizophrenia to local state hospitals and the other from a low admission group. It was intended that these areas should differ markedly in the quality of their cultural life but be similar with respect to the age, sex, and racial distribution of their population.
"Cass," the high-rate subcommunity, was a decaying, heterogeneous, low socioeconomic area seething with conflict, and this was contrasted with the low rate "Connor-Burbank" district, a middle class, homogeneous conforming suburb. Racial comparability was not obtained, nonwhites constituting about one third of
Olley P. Community and Schizophrenia: An Epidemiological Analysis.. Arch Gen Psychiatry. 1966;15(4):444–445. doi:10.1001/archpsyc.1966.01730160108022
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