After controlling for age and measured hormone levels (FSH, LH, TSH, PRL, ACTH and cortisol), we confirmed a significant difference in GH levels (F(1,63) = 9.504, P = 0.003 for age; F(1,63) = 7.238, P = 0.009 for FSH; F(1,63) = 8.429, P = 0.005 for LH; F(1,63) = 9.891, P = 0.003 for TSH; F(1,63) = 9.033, P = 0.004 for PRL; F(1,62) = 6.611, P = 0.013 for ACTH; and F(1,60) = 4.687, P = 0.034 for cortisol) between subjects with autism and controls. Here, PRL is linked to autism.