Using logistic regression, we initially examined OXTR SNPs with prior evidence of genotype effects on social abilities within each diagnostic group (in ASD: rs53576, rs2254298, and rs237887; in ADHD: rs53576 and rs13316193), restricting the sample to those of Caucasian ancestry only, and adjusting for other possible confounding factors (see Methods). The gene discussed is OXTR; the disease is attention deficit-hyperactivity disorder.