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Table 1 Sample characteristics

From: Relationship between endophenotype and phenotype in ADHD

  first-borns (N= 331) second-borns (N= 323)
  affected non-affected control    affected non-affected control   
  N = 143 (43%) N = 68 (21%) N = 120 (36%)    N = 132 (41%) N = 78 (24%) N = 113 (35%)   
  M SD M SD M SD F 2,328 contrasts1 M SD M SD M SD F 2,320 contrasts1
age in years 13.2 2.6 14.9 2.7 13.3 2.7 10.9 2 > 1 = 3 11.6 2.7 9.7 2.4 10.6 2.9 11.3 1 > 2 = 3
% male 76.9   45.6   44.2   34.82 1 > 2 = 3 75.8   48.7   38.1   37.42 1 > 2 = 3
estimated full scale IQ 99.8 11.8 101.8 10.7 106.2 9.9 11.3 1 = 2 < 3 99.2 11.8 105.5 10.9 105.6 10.1 13.2 1 < 2 = 3
Conners' parent DSM-IV                 
   inattentive 68.6 10.0 48.6 7.2 46.3 4.5 306.6 1 > 2 = 3 69.7 10.4 46.8 6.5 46.7 4.9 329.9 1 > 2 = 3
   hyperactive-impulsive 75.4 12.9 48.4 6.9 47.3 4.9 343.1 1 > 2 = 3 76.0 11.3 49.6 6.8 47.6 5.2 410.0 1 > 2 = 3
Conners' teacher DSM-IV                 
   inattentive 64.1 9.5 48.8 6.4 46.2 4.7 211.4 1 > 2 = 3 65.7 9.3 48.0 5.6 46.3 4.2 279.0 1 > 2 = 3
   hyperactive-impulsive 68.2 11.7 48.5 7.7 46.3 3.9 236.2 1 > 2 = 3 69.0 11.5 47.7 4.7 47.2 5.5 260.5 1 > 2 = 3
  1. Note. 1 = affected; 2 = non-affected; 3 = controls. 1 = contrasts based on p-values of ≤ .05. 2 = χ2.
  2. ADHD = Attention-Deficit/Hyperactivity Disorder; DSM-IV = Diagnostic and Statistical Manual for Mental Disorders (4th edition).