Table 2 Chi-square test of variable independence
Risk contributes | Jiangxi | Shaanxi | ||||
|---|---|---|---|---|---|---|
χ2 | p value | Degree of freedom | χ2 | p value | Degree of freedom | |
Driver factors | ||||||
Gender | 21.335** | <0.001 | 1 | 17.463** | <0.001 | 1 |
Marital status | 46.412 | 0.062 | 3 | 31.231 | 0.157 | 3 |
Age | 13.167** | <0.001 | 2 | 21.117** | <0.001 | 2 |
Driving experience | 6.493** | 0.003 | 3 | 7.062** | <0.001 | 3 |
Occupation | 5.615 | 0.186 | 6 | 8.133 | 0.105 | 6 |
Vehicle factors | ||||||
Vehicle type | 96.434** | <0.001 | 1 | 104.212** | <0.001 | 1 |
Commercial transport | 51.601* | 0.035 | 1 | 77.465* | 0.008 | 1 |
Vehicle insurance | 67.293* | 0.044 | 1 | 44.047 | 0.092 | 1 |
Vehicle safety status | 37.307 | 0.061 | 1 | 19.691 | 0.106 | 1 |
Vehicle brake performance | 46.269** | <0.001 | 1 | 8.673** | <0.001 | 1 |
Roadway factors | ||||||
Road type | 117.355* | 0.027 | 6 | 129.330* | 0.016 | 6 |
Highway specific locations | 56.493** | <0.001 | 7 | 42.092** | <0.001 | 7 |
Urban road specific locations | 9.038 | 0.103 | 4 | 11.767 | 0.088 | 4 |
Pavement condition | 11.764** | <0.001 | 1 | 2.439** | <0.001 | 1 |
Environment factors | ||||||
Time of crash | 23.697** | <0.001 | 2 | 84.465* | 0.031 | 2 |
Day of the week | 4.611 | 0.084 | 1 | 6.731 | 0.089 | 1 |
Seasons | 7.498* | 0.037 | 3 | 14.222* | 0.011 | 3 |
Public holiday | 2.176 | 0.549 | 1 | 7.769 | 0.115 | 1 |
Weathercondition | 8.335** | <0.001 | 1 | 1.005** | <0.001 | 1 |
Visibility condition | 41.987** | <0.001 | 1 | 17.343** | <0.001 | 1 |
Traffic violations | ||||||
Alcohol-impaired driving | 33.764 | 0.298 | 1 | 23.646 | 0.089 | 1 |
Disregarding speed limits | 11.028** | <0.001 | 1 | 17.988** | 0.003 | 1 |
Overloading | 5.169** | <0.001 | 1 | 3.497** | <0.001 | 1 |
Risky following | 22.633* | 0.027 | 1 | 15.238 | 0.061 | 1 |
Failure to use seat belt | 6.961 | 0.055 | 1 | 8.441 | 0.107 | 1 |
Cell phone use | 46.376 | 0.086 | 1 | 98.493 | 0.064 | 1 |
Illegal meeting | 5.108 | 0.161 | 1 | 4.767 | 0.055 | 1 |
Crash characteristics | ||||||
Injury outcome | 35.469** | <0.001 | 3 | 26.894** | <0.001 | 3 |
Type of collision | 71.336* | 0.033 | 5 | 89.471* | 0.022 | 5 |
Collision partner | 23.089** | <0.001 | 4 | 16.746** | 0.004 | 4 |