Shown are the measured mean oxytocin levels with standard deviation, 95% confidence intervals, p-values for comparisons within and between the groups, F-values and the effect size (Hedges’ g) before and after music therapy [MT] or the waiting list control group [WLC] for the total sample, group 1, group 2, the music therapist and the subgroups of children with autism spectrum disorder [ASD] and those with medication. The gene discussed is OXT; the disease is autism spectrum disorder.