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Table 3 Adjusted odds ratios (95 % confidence intervals) in stepwise logistic regression analysis

From: Exploring background risk factors for fatigue crashes involving truck drivers on regional roadway networks: a case control study in Jiangxi and Shaanxi, China

Risk contributes Jiangxi Shaanxi
SE Odds ratio 95 % CI SE Odds ratio 95 % CI
Driver factors
Gender (base: female)
 Male 0.271 1.846 (1.172, 2.864) 0.145 0.621 (0.376, 1.083)
Age (base: old)
 Young 0.415 0.663 (0.507, 0.851) 0.766 3.867 (2.437, 4.661)
 Adult 0.334 0.681 (0.313, 0.946)
Driving experience in years (base: expert)
 Novice 0.692 4.787 (2.986, 7.129) 0.249 1.465 (0.745, 1.420)
Driver’s occupation (base: others)
 Employed workers 0.253 0.565 (0.310, 0.675)
Vehicle factors
Commercial transport (base: no)
 Yes 1.237 1.688 (1.233, 2.825) 0.655 1.328 (0.891, 2.262)
Vehicle brake performance (base: good)
 Poor 1.454 1.817 (1.257, 2.094) 0.826 1.174 (0.907, 1.771)
Roadway factors
Road type (base: rural road)
 Expressway 1.976 4.248 (3.331, 4.795) 1.652 2.468 (1.762, 3.455)
Highway specific locations (base: others)
 Sharp curve 0.343 0.785 (0.512, 1.317) 0.376 0.981 (0.637, 1.785)
 Long steep grade 1.364 2.176 (1.108, 2.766) 0.895 1.364 (0.825, 2.007)
 Tunnel 1.498 2.176 (1.383, 3.699)
 Bridge 0.637 1.419 (1.124, 3.006)
Pavement condition (base: dry)
 Wet 1.626 1.764 (1.433, 1.859) 5.785 8.463 (4.798, 17.285)
Environment factors
Time of crash (base: 6 am to 8 pm)
 0 am–6 am 0.729 0.907 (0.561, 0.976) 0.770 1.418 (1.117, 1.990)
Seasons (base: autumn)
 Summer 0.664 0.847 (0.543, 1.087)
 Winter 0.881 1.465 (1.043, 2.557) 1.083 0.764 (0.626, 1.655)
Weather condition (base: fine)
 Adverse 0.260 0.518 (0.284, 0.809) 0.785 0.988 (0.438, 1.097)
Visibility condition (base: good)
 Poor 1.429 1.376 (0.877, 1.740) 1.178 1.496 (1.133, 2.466)
Traffic violations
Disregarding the speed limits (base: not speeding)
 Speeding 1.465 2.349 (1.875, 3.941) 1.625 2.137 (1.339, 4.081)
Overloading condition (base: not overloading)
 Overloading 1.681 0.848 (0.464, 1.223) 1.464 1.209 (1.177, 1.699)
Crash characteristics
Injury outcome (base: slight injury)
 Moderate injury 0.313 0.686 (0.416, 0.988) 0.117 0.464 (0.374, 0.628)
 Serious injury 0.744 1.337 (0.754, 1.767) 0.086 0.752 (0.691, 1.476)
 Fatal injury 1.163 1.559 (1.145, 2.386) 0.439 1.767 (1.422, 2.897)
Type of collision (base: others)
 Head-on collision 0.176 1.394 (0.933, 2.498) 0.460 1.128 (0.866, 2.743)
 Sideswipes 0.698 1.765 (1.174, 3.992) 0.533 1.665 (1.439, 3.078)
 Rear-end collision 0.375 1.567 (1.044, 2.363) 1.176 2.061 (1.414, 3.665)
 Runoff 0.421 0.764 (0.297, 1.170)
Collision partner (base: two trucks)
 A single truck 0.706 0.911 (0.665, 1.127) 1.142 1.869 (1.394, 2.527)
 A truck and a passenger vehicle 1.163 1.455 (0.896, 1.772) 1.068 1.241 (1.076, 1.718)
 Multiple vehicles 1.467 1.893 (1.226, 2.674) 1.383 2.057 (0.896, 2.963)
 Truck(s) and vulnerable road user(s) 0.658 0.896 (0.623, 0.972) 0.764 0.883 (0.653, 1.450)
Model estimation measures
 Percentage 84.36 82.55
 ROC 0.877 0.863
 N 5447 3721