The frequency of XYY and XXY men among criminal offenders
Schröder, J.; de la Chapelle, A.; Hakola, P.; Virkkunen, M.
Acta Psychiatrica Scandinavica 63(3): 272-276
Among 1040 consecutive male criminals remitted for mental examinations, 9 had the karyotype 47,XYY, 1 had 48,XXYY and 11 had 47,XXY. The types of crime in the XYY men were much like those in the XXY men, the proportion of sexual crimes possibly being greater than among other criminal offenders. The reasons for these findings are discussed.