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We established first-contact rates of schizophrenia in the defined area of Camberwell between 1965 and 1984. The rate of schizophrenia, whether defined by ICD, RDC, or DSM-III criteria, rose over the period under study. This finding is at odds with reports of an overall decline in first-admission rates for schizophrenia in England, over the same period. The discrepancy was largely accounted for by the influx into Camberwell of individuals of Afro-Caribbean origin, who showed rates of schizophrenia between four and eight times that of their Caucasian counterparts.
Castle et al. (Sun,) studied this question.