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Table 2 Percentage and Chi-square values with p-values of characteristics and circumstances of RTC involving a young driver stratified by license status, 1998 to 2004 (n = 21 386)

From: Road traffic crash circumstances and consequences among young unlicensed drivers: A Swedish cohort study on socioeconomic disparities

  Licensed n = 19864 Unlicensed n = 1522 Chisq value Degrees of freedom P-value for chisq
Sex      
   Male 72.50 85.09 114.7 1 <.0001
   Female 27.50 14.91    
Suspected impaired driving      
   Yes 4.54 43.72 2571.0 1 <.0001
   No 95.46 56.28    
Injury outcome for the young driver involved in the crash1      
   Fatal 0.01 18.97 3842.2 3 <.0001
   Severe injury 10.22 16.44    
   Minor injury 57.19 45.41    
   No injury 32.59 19.17    
Most serious injury outcome for other persons involved in the crash2      
   Fatal 1.19 20.76 2215.8 2 <.0001
   Severe injury 17.42 21.81    
   Minor injury 81.39 57.42    
Speed restriction limit      
   50 km/hour or less 45.65 41.98 6.9 2 0.0324
   70 km/hour 26.94 27.92    
   90 km/hour or more 27.41 30.10    
Time of day      
   0600-1859 67.70 44.15 552.5 2 <.0001
   1900-2259 18.25 18.97    
   2300-0559 14.05 36.88    
Light conditions      
   Daylight 57.98 41.16 161.2 2 <.0001
   Darkness 33.83 47.54    
   Dusk/dawn 8.19 11.30    
Weather conditions      
   Dry (fair) 79.82 82.27 15.1 4 0.0046
   Haze 2.72 3.56    
   Rain 11.78 10.20    
   Sleet 1.82 1.51    
   Snow 3.85 2.46    
Road surface conditions      
   Dry 54.11 58.91 25.7 4 <.0001
   Wet/damp 29.24 29.08    
   Thick ice/packed snow 3.44 2.46    
   Thin ice 7.68 6.21    
   Light snow/snow slush 5.54 3.34    
Urbanicity of crash site      
   Urban area 52.61 46.98 17.8 1 <.0001
   Rural area 47.39 53.02    
  1. 1 Injury outcomes for the young driver were classified into four categories: (1) no physical injury; (2) minor injury not requiring hospital care; (3) serious injury requiring hospital care; and (4) fatality.
  2. 2 The most serious injury to other persons involved in the crash were classified thus: (1) no or minor injury not requiring hospital care; (2) serious injury requiring hospital care; and (3) fatality.