Eysenck's Psychoticism and the X-linked androgen receptor gene CAG polymorphism in additional Australian samples

Data from existing Brisbane samples of adult women, and of adolescents of both sexes, were examined in an effort to replicate the Canberra finding of Turakulov, Jorm, Jacomb, Tan, and Easteal (2004); namely, an association between scores on Eysenck's Psychoticism (P) scale and short CAG sequences on the androgen receptor gene. They found a significant association in this direction in males, and a similar (although nonsignificant) one in females. Some support was found for a relationship between P scores and short CAG sequences in the Brisbane female samples, but the adolescent boys showed differences which, although small, tended to lie in the opposite direction. Correlations of CAG sequence length with P suggested that the sequence length, at best, accounted for only a very small proportion of the variance of P.