Sex chromosome abnormalities in two state hospitals for patients requiring special security
Casey, M. D.
Segall, L. J.
Blank, C. E.
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THE association between sex chromatin abnormality and mental sub-normality is well established. The incidence of sex chromatin abnormality in the new-born male and female population is about 0.2 per cent and 0.08 per cent respectively; in institutionalized mentally sub-normal male and female populations about 1 per cent and 0.4 per cent respectively. Court Brown1 reported that a high proportion of sex chromatin positive males recognized in his unit had been committed to a mental defective institution because of anti-social behaviour. He suggested that an abnormal sex chromosome complement might predispose to delinquency. However, a survey by Wegman and Smith2 on a group of socially disturbed males of relatively normal intelligence failed to show an increase in sex chromatin abnormality.