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Table 1 Demographic and clinical characteristics of ADHD subjects and controls

From: Association between the GRM7 rs3792452 polymorphism and attention deficit hyperacitiveity disorder in a Korean sample

  ADHD (n = 202) Controls (n = 159)
Age (years), mean ± SD 9.0 ± 2.5 9.0 ± 2.7
Sex (males/females) 174/28 111/48
IQ, mean ± SD 106.1 ± 14.7 114.8 ± 15.3
ADHD subtype, %   
Combined 63.0  
Inattentive 24.5  
Hyperactive-impulsive 6.0  
Not otherwise specified 6.5  
Comorbid disorder, %   
Oppositional defiant disorder 14.4  
Conduct disorder 1.5  
Depressive disorder 3.5  
Anxiety disorder 6.5  
Enuresis 5.5  
  1. Abbreviations: ADHD attention-deficit hyperactivity disorder, IQ intellectual quotient.