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Table 1 Sample description

From: Cognitive correlates of attention-deficit hyperactivity disorder in children and adolescents with high intellectual ability

  ADHD + IQ ≥ 120 Control + IQ ≥ 120 ADHD + IQ 90–110 Control + IQ 90–110 χ2
Student’s t test
F
N M (SD)/% N M (SD)/% N M (SD)/% N M (SD)/%
Cohort 1
 ADHD diagnosis
  Inattentive 21 41.2    17 33.3    n.s
  Hyperactive 5 9.8    7 13.7    
  Combined 22 43.1    25 49    
  Unspecified 3 5.9    2 3.9    
 IQ score 51 126.2 (5.1) 51 126.9 (5.5) 51 101.3 (4.9) 51 101.5 (4.3) n.s*
 Age in years 51 15.4 (4.5) 51 15.1 (4.4) 51 15.4 (4.5) 51 15.3 (4.4) n.s
 Gender
  Male 29 56.9 29 56.9 29 56.9 29 56.9 n.s
Cohort 2
 ADHD diagnosis
  Inattentive 10 47.7    10 47.7    n.s
  Hyperactive 3 14.3    3 14.3    
  Combined 8 38.1    8 38.1    
 IQ score 21 124 (3.2) 21 124 (3.2) 21 97.2 (4.2) 21 97.2 (4.2) n.s*
 Age in years 21 11.18 (0.6) 21 11.11 (0.42) 21 11.15 (0.42) 21 11.20 (0.48) n.s
 Gender
  Male 17 81 17 81 17 81 17 81 n.s
  1. n.s* no significance between IQ-matched groups