In contrast to our data, the COMT rs4680 GG genotype was linked to aggressive symptoms of CD in young people with ADHD [61], or with more violent behavior and an increased risk of misconduct in children with ADHD [62], or with the risk of more severe symptoms of CD in male adolescent delinquents with ADHD confined in the correctional facility [63]. This evidence concerns the gene COMT and attention deficit-hyperactivity disorder.