Variables Injured Uninjured Difference in averages (CI95%) p Km 197.8(86.4) 153.6(107.4) 44.1( -20.7,108.9) 0.19 Races 6.5(2.5) 4.9(3.4) 1.5(-0.38, 3.4) 0.19

Table 4: Differences between injured and uninjured drivers by number of races and km completed. The results are presented as an average, (SD) and differences of the averages with CI 95%.