Prevalence of XYY and XXY karyotypes in 337 nonretarded young offenders

XYY individuals in a special school

The steady stream of publications on the XYY syndrome, including recent papers by Christensen and Nielsen (1973) and a comprehensive review by Hook (1973), demonstrates clearly that confirmation or refutation of the relationship in this syndrome between dull intelligence, even mental deficiency, and impulsive or delinquent behaviour requires further evidence. In an attempt to supply such evidence this report presents psychological and anthropometric information about five XYY subjects detected from amongst attenders at the Special School in the city of Aberdeen.

Cytogenetic survey of XYY males in two juvenile court populations, with a case report

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Height and antisocial behavior in XY and XYY boys

The observed association of the XYY genotype with both (i) large height in childhood and (ii) institutionalization for antisocial behavior suggested that large size per se in childhood might tend to establish personality patterns leading to eventual incarceration for delinquency. To investigate this question, the height distributions of four groups of XY boys in institutions for nonpsychotic, nonretarded juvenile offenders were compared with the published standards as well as the predicted gaussian distributions calculated from the mean and variance of the age-adjusted heights of each group. In none of these groups was there evidence for an increased number of large individuals. But three XYY individuals in the same institutions all had heights greater than the 90th percentile of XY boys of the same race.