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Table 1 Group data for age, ADHD symptoms, self-reported driving behaviour and driving history

From: Driving behaviour in adults with attention deficit/hyperactivity disorder

  Control (N = 21) ADHD (N = 22) Group difference
  Mean (SD) Mean (SD) t-value
Age 34.0 (13.8) 31.4 (10.2) 0.687
CAARS (T score)    
ADHD symptoms total 48.5(10.2) 82.5(8.5) 12.07**
Hyperactive-Impulsive symptoms 43.6(7.0) 73.6(9.3) 11.88**
Inattentive symptoms 50.7(15.3) 80.9(9.0) 7.82**
Manchester Driving Behaviour Questionnaire    
Errors 3.4(3.8) 4.7(4.2) 1.02
Violations 4.3(3.5) 11.2(7.0) 3.94**
Lapses 7.6(5.1) 15.1(7.0) 3.94**
Driving history    
Years since passing test 13.7(12.9) 10.6(8.7) 0.91
Times taken test 1.6(1.0) 2.1(1.9) 1.11
Number of accidents since test 0.95(0.92) 1.89(1.28) 2.65*
Accident serious enough for insurance claim 0.57(0.81) 1.55(1.88) 2.18*
Accidents involving injury 0.14(0.36) 0.32(0.48) 1.28
Penalty points on licence 0.14(0.65) 1.21(2.55) 1.77
Annual mileage 6186(5125) 10632(9135) 1.87
Number of hours driving a week 6.5(5.8) 8.5(8.9) 0.88
  1. CAARS = Conners Adult ADHD Rating Scale. The data shown for the CAARS are group mean T-scores for which the standardised (population) mean score is 50 and the standard deviation is 10
  2. *p < .05 **p < .01