SLC6A4 and Oppositional defiant disorder: And SLC6A4 rs6354 GT/GG genotype carriers with PSE also showed an increased association in hyperactivity and ADHD-ODD symptoms (hyperactivity domain: OR = 2.92, 95% CI = 1.10–7.75, p = 0.031; ODD domain: OR = 4.42 95% CI = 1.32–14.79, p = 0.016.Table S4).