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Table 2 genotype frequency of COMT and MAOA between two phenotypes

From: Attention Deficit Hyperactivity Disorder comorbid oppositional defiant disorder and its predominately inattentive type: evidence for an association with COMT but not MAOA in a Chinese sample

   ADHD with ODD (n = 56) ADHD without ODD (n = 115) X2 P
COMT ValVal 31 (55.4%) 42 (36.5%)   
  ValMet/MetMet 25 (44.6%) 73 (63.5%) 5.461 0.019
MAOA 3R 38 (67.9%) 81 (70.4%)   
  4R 18 (32.1%) 34 (29.6%) 0.118 0.731