CYP2D6 and major depressive disorder: The strongest one was observed between DRD2 and the frequency of alcohol consumption (p = 2.88E−08), followed by associations between the same gene (DRD2) and SCZ (p = 1.55E−07), CYP2D6 and SCZ (p = 1.81E−06), CHRM2 and major depressive disorder (p = 2.56E−06).