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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