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Table 1 Demographics and descriptive statistics for ADHD cases and non-ADHD controls.

From: Gene × environment interactions for ADHD: synergistic effect of 5HTTLPR genotype and youth appraisals of inter-parental conflict

  Control (N = 137) ADHD (N = 151) p
% Male 48.2 64.2 .006
% Caucasian 74.5 78.1 .46
% African-American 14.6 11.3 .40
% Latino 6.6 3.3 .20
% Other 4.4 7.3 .30
Age (SD) 14.7 (2.4) 13.5 (2.8) <.001
% Both Biological Parents 71.5 60.3 .044
% Parents Separated/Divorced 10.9 18.5 .071
% Parents Re-Partnered 17.5 21.2 .43
Yearly Household Income (SD)+ 74 (36) 63 (36) .02
KSAD Diagnostics    
   Inattentive Symptoms (SD) 1.2 (2.0) 7.3 (1.8) <.001
   Hyperactive Symptoms (SD) .57 (1.1) 4.1 (3.2) <.001
   % ODD 8.8 27.2 <.001
   % CD 1.5 9.9 .002
   % MDD 10.2 21.9 .008
Conners' Teacher Report    
   Cognitive Problems T Score 51.8 (12.3) 61.7 (14.6) <.001
   Hyperactivity T score 49.8 (9.3) 60.3 (11.8) <.001
ADHD Rating Scale -- Teacher Report    
   Inattentive Symptoms .62 (1.7) 4.0 (3.2) <.001
   Hyperactive Symptoms .32 (.10) 2.1 (2.8) <.001
5HTTLPR Genotype    
   % High Activity (La/La) .28 .25 .53
   % Moderate Activity (La/Lg, La/s) .42 .46 .49
   % Low Activity (Lg/Lg, Lg/s, or s/s) .30 .29 .88
CPIC Self-Blame Score 1.9 (3.0) 4.1 (3.6) <.001
CPIC Conflict Properties Score 9.1 (5.5) 11.6 (5.0) <.001
  1. Note. SD = standard deviation; ODD = Oppositional Defiant Disorder; CD = Conduct Disorder; MDD = Major Depressive Disorder-Lifetime. KSADS-E Diagnostics based upon parent report.
  2. + Income in thousands of dollars.