Abstract  
COMT Val

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Met polymorphism has been associated with both symptoms of attention-deficit/hyperactivity disorder (ADHD) and disruptive behavior
disorders (DBD): that is, oppositional defiant disorder (ODD) and conduct disorder (CD) often comorbid with ADHD. The aim
of this study was to test the association between COMT Val

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Met polymorphism and the presence of DBD in children with ADHD (n = 516). Homozygous Val/Val children showed a higher prevalence of ADHD comorbid with DBD (

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