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Table 2 Group comparisons of simulator performance and eye movement measures for the urban and motorway routes

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

  Control ADHD Statistical analysis
  Urban Motorway Urban Motorway Group Road type Group*Road type
Simulator variables F(1,41) F(1,41) F(1,41)
Distance over speed limita 0.08 (0.06) 0.16 (0.14) 0.14 (0,14) 0.25 (0.19) 4.40* 17.85** 0.37
Forward speed (mph) 14.9 (2.3) 62.4 (4.8) 16.7 (2.4) 66.0 (6.1) 5.96* 4522.67** 1.60
Coefficient variation velocity 0.70 (0.11) 0.15 (.05) 0.67 (0.12) 0.15 (0.06) 1.67 886.12** 1.17
Lane deviationb 0.55 (0.06) 0.99 (0.25) 0.53 (0.13) 0.94 (0.07) 1.22 193.17** 0.21
Eye movement variables F(1,37) F(1,37) F(1,37)
Horizontal spread search 21.15 (14.79) 18.33 (13.13) 21.58 (14.97) 16.50 (14.09) .06 27.79** 1.34
Vertical spread search 10.97 (7.55) 11.96 (7.16) 11.59 (9.65) 11.88 (10.90) .07 5.81* .85
Fixation duration (ms) 381 (89) 424 (150) 394 (130) 489 (200) .16 5.22* .06
  1. *p < .05 ** p< .01
  2. aDistance over speed limit is calculated as the proportion of the distance travelled in excess of 10 % of the speed limit for that road section plus two miles
  3. bLane deviation is calculated as the standard deviation of lateral position in metres