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Table 1 Description of explanatory variables

From: Interpreting risk factors for truck crash severity on mountainous freeways in Jiangxi and Shaanxi, China

Explanatory Variable PDO Injury Fatality Total
N % N % N % N
Total Crash 629 53.53 386 32.85 160 13.62 1175
Driver characteristics
 Gender
  Femalea 22 1.87 34 2.89 18 1.53 74
  Male 607 51.66 352 29.96 142 12.09 1101
 Age
  Young (<  30 years)a 120 10.21 59 5.02 24 2.04 203
  Adult (30~50 years) 440 37.45 253 21.53 99 8.43 792
  Old (>  50 years) 69 5.87 74 6.30 37 3.15 180
 Seatbelt status
  Useda 531 45.19 212 18.04 67 5.70 810
  Not used 98 8.34 174 14.81 93 7.91 365
Vehicle attributes
 Number of vehicle involved
  Singlea 244 20.76 89 7.57 43 3.66 376
  Multiple 385 32.77 297 25.28 117 9.96 799
 Type of vehicle
  Commercial transport 629 53.53 355 30.21 139 11.83 1123
  Othersa 0 0 31 2.64 21 1.79 52
 Conditions of freight
  Not overloadinga 531 45.19 151 12.85 3 0.26 685
  Overloading 98 8.34 235 20.00 157 13.36 490
 Brake system
  Not faileda 384 32.68 143 12.17 33 2.81 560
  Failed 245 20.85 243 20.68 127 10.81 615
 Roadway speed limit
  Regardinga 511 43.49 152 12.94 7 0.60 670
  Disregarding 118 10.04 234 19.91 153 13.02 505
 Following distance
  Safea 388 33.02 83 7.06 18 1.53 489
  Unsafe 241 20.51 303 25.79 142 12.09 686
Road geometrics
 Horizontal alignment
  Straighta 332 28.25 153 13.02 15 1.28 500
  Curve 297 25.28 233 19.83 145 12.34 675
 Vertical alignment
  Levela 99 8.42 102 8.68 55 4.68 256
  Upgrade 43 3.66 36 3.06 18 1.53 97
  Downgrade 487 41.45 248 21.11 87 7.41 822
Environmental conditions
 Season
  Springa 184 15.66 37 3.15 0 0 221
  Summer 123 10.47 133 11.32 25 2.13 281
  Autumn 189 16.08 18 1.53 8 0.68 215
  Winter 133 11.32 198 16.85 127 10.81 458
 Day of week
  Weekends/holidaysa 157 13.36 138 11.74 46 3.92 341
  Weekday 472 40.17 248 21.11 114 9.70 834
 Time of crash
  Daytimea 538 45.79 205 17.45 19 1.62 762
  Nighttime 91 7.74 181 15.40 141 12.00 413
 Weather
  Finea 552 46.98 205 17.45 13 1.11 770
  Adverse 77 6.55 181 15.40 147 12.51 405
  1. aReference category