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Table 1 Demographic and clinical characteristics (Frequency or Mean and SD) of children with ADHD and controls

From: Contributions of circadian tendencies and behavioral problems to sleep onset problems of children with ADHD

Variable ADHD (n = 26 ) Control (n = 49) Test statistic p
Gender (M/F) 17/9 30/19 χ 2(1) = 0.13 .72
Age 8.46 (1.5) 8.69 (1.2) F(1,73) = 1.96 .17
Ethnic Background    χ 2(4) = 4.31 .37
 Caucasian 21 33   
 African 0 1   
 Asian 0 6   
 Multi-ethnic 3 4   
 Unknown 2 5   
SES 50.3 (10.74) 50.7 (11.5) F(1,47) = .03 .86
IQ 98.9 (17.5) 105.7 (13.6) F(1,68) = 2.34 .13
Pubertal Development 6.5 (2.2) 6.7 (1.7) F(1,73) = .27 .61
Conners’ ADHD Index- parent 65.77 (11.84) 49.32 (7.64) F(1,71) = 7.81 .007
ADHD subtype    χ 2(3) = 58.67 <.001
 No 0 49   
 Combined 17 0   
 Inattention 8 0   
 Hyperactive-Impulsive 1 0   
Comorbid ODD 8 0 χ 2(1) = 16.88 <.001
Comorbid CD 2 0 χ 2(1) = 3.87 .05
CBCL     
 Internalizing 60.13 (8.71) 50.42 (9.02) F(1,73) = 19.7 <.001
 Externalizing 59.2 (9.25) 49.7 (8.52) F(1,73) = 24.1 <.001
 Total 62.3 (8.49) 49.40 (9.04) F(1,73) = 42.53 <.001
  1. Note: ADHD = attention-deficit/hyperactivity disorder; SES = socioeconomic status; DISC-IV = Diagnostic Interview Schedule for Children, Fourth Edition; ODD = oppositional defiant disorder; CD = conduct disorder; CBCL = Child Behavior Checklist; All means are T-score transformed.