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Table 1 Description of the samples

From: The impact of instruction and response cost on the modulation of response-style in children with ADHD

  ADHD (N = 34) Controls (N = 34) p
Age (mean, SD) 10.2 (2.0) 10.1 (1.82) n.s.
   range 7.1-13.7 7.1-13.9  
IQ (mean, SD) 105.6 (14.4 ) 106.5 (15.1) n.s.
Ratio boys/girls 29/5 28/6 n.s.
Parent Ratings SNAP (mean raw scores, SD)    
   Inattention 15.9 (5.8) 6.6 (5.1) .000
   Hyperactivity 6.8 (3.4) 1.4 (1.7) .000
   Impulsivity 5.8 (2.8) 2.0 (1.9) .000
   Oppositional/Aggressive 9.3 (5.7) 4.0 (3.1) .000
SDQ (mean raw scores, SD)    
   Hyperactivity 7.5 (1.9) 2.5 (2.1) .000
   Behavioral problems 3.5 (2.6) 1.3 (1.0) .000
Teacher Ratings CTRS (mean T-scores, SD)    
   ADHD Index 65.9 (7.3) 47.6 (6.3) .000
   DSM IV Inattentive 65.0 (8.0) 47.6 (6.8) .000
   DSM IV Hyperactive- Impulsive 64.0 (9.4) 47.6 (8.0) .000
   Oppositional 59.0 (9.9) 51.1 (7.3) .000