Table 3.
Analysis results of ordered multiple classification Logistic regression.
| Influencing Factors | B | S.E. | Wald χ2 | OR | OR Value of 95% of CI | p Value |
|---|---|---|---|---|---|---|
| Constant term | ||||||
| Deaths | −1.461 | 0.539 | 9.624 | 0.23 | 0.09–0.63 | 0.000 |
| Injuries | 1.790 | 0.524 | 7.501 | 0.94 | 0.58–1.41 | 0.001 |
| Property loss (control) | — — | — | — — | — | — — — — | — — |
| Illegal behavior | ||||||
| Overload | −1.384 | 0.513 | 0.648 | 1.41 | 0.57–1.54 | 0.039 |
| Fatigue driving | −1.934 | 0.736 | 1.370 | 1.20 | 0.78–1.95 | 0.018 |
| Illegal carriage (control) | — — | — | — — | — | — — — — | — — |
| Unsafe driving behavior | ||||||
| Failure to maintain a safe distance | −1.435 | 0.166 | 4.740 | 1.647 | 1.19–2.38 | 0.036 |
| Expressive speed | −1.236 | 0.387 | 1.324 | 1.539 | 0.94–2.42 | 0.025 |
| Improper operation (control) | — — | — | — — | — | — — — — | — — |
| Accident liability | ||||||
| Hazardous materials vehicles | −2.429 | 0.307 | 12.814 | 2.363 | 1.51–2.97 | 0.019 |
| Other vehicles (control) | — — | — — | — — | — — | — — — — | — — |
| Packing problem | ||||||
| Valve failure | −0.597 | 0.073 | 1.524 | 0.302 | 0.08–0.62 | 0.374 |
| Broken tank | −0.798 | 0.175 | 0.493 | 0.450 | 0.11–0.89 | 0.558 |
| Tank fire (control) | — — | — — | — — | — — | — — — — | — — |
| Vehicle Problem | ||||||
| Flat tire | −1.202 | 0.339 | 1.393 | 1.095 | 0.52–1.78 | 0.443 |
| Loss control | −1.096 | 0.128 | 2.470 | 1.201 | 0.63–1.92 | 0.007 |
| Brake failed | −0.277 | 0.076 | 0.467 | 0.478 | 0.13–0.96 | 0.231 |
| Engine fire | −0.176 | 0.277 | 0.394 | 0.166 | 0.02–0.41 | 0.209 |
| Other | −0.576 | 0.292 | 0.612 | 0.892 | 0.34–1.57 | 0.345 |
| Other vehicle problem (control) | — — | — — | — — | — — | — — — — | — — |
| Vehicle category | ||||||
| Tank truck | −1611 | 0.148 | 8.166 | 4.942 | 2.22–7.30 | 0.000 |
| Oil tank truck | −1.590 | 0.204 | 7.791 | 3.507 | 1.94–6.79 | 0.000 |
| truck | 3.888 | 0.314 | 5.468 | 1.848 | 0.636–3.50 | 0.027 |
| Illegally modified vehicle (control) | — — | — — | — — | — — | — — — — | — — |
| Weather | ||||||
| Sunny | 1.370 | 0.351 | 4.302 | 0.733 | 0.23–1.59 | 0.778 |
| Cloudy | 1.813 | 0.342 | 6.099 | 1.393 | 0.64–2.11 | 0.046 |
| Rainy | −2.346 | 0.445 | 9.787 | 2.622 | 1.28–4.09 | 0.003 |
| Haze (control) | — — | — | — — | — | — — — — | — — |
| Lighting | ||||||
| Night lighting | −0.751 | 0.212 | 0.452 | 1.707 | 0.92–3.12 | 0.304 |
| Night without lighting | −1.008 | 0.588 | 4.357 | 1.111 | 0.44–1.89 | 0.032 |
| Daytime (control) | — — | — — | — — | — — | — — — — | — — |
| Month Distribution | ||||||
| First quarter | −0.871 | 0.177 | 0.366 | 1.174 | 0.47–1.64 | 0.328 |
| Second quarter | −0.563 | 0.242 | 2.259 | 2.399 | 1.51–3.35 | 0.027 |
| Third quarter | −0.572 | 0.357 | 1.829 | 1.978 | 1.26–2.77 | 0.079 |
| Fourth quarter (control) | — — | — — | — — | — — | — — — — | — — |
| Road Grade | ||||||
| Expressway | −0.451 | 0.441 | 8.759 | 2.619 | 1.55–3.78 | 0.049 |
| National highway | −0.871 | 0.328 | 4.588 | 1.538 | 0.76–2.31 | 0.036 |
| Provincial highway | −1.741 | 0.256 | 4.389 | 1.174 | 0.69–1.84 | 0.022 |
| Urban road(intersection) | −0.696 | 0.339 | 2.373 | 1.068 | 0.48–1.78 | 0.008 |
| County road and below (control) | — — | — — | — — | — — | — — — — | — — |
| Regional Distribution | ||||||
| North China | −1.473 | 0.502 | 2.619 | 1.52 | 0.88–2.24 | 0.002 |
| East China | −0.473 | 0.354 | 8.594 | 2.21 | 1.53–2.89 | 0.041 |
| South China | −0.798 | 0.305 | 1.679 | 1.14 | 0.56–1.75 | 0.626 |
| Central China | −1.368 | 0.399 | 1.829 | 1.28 | 0.61–1.92 | 0.791 |
| Northwest China | −1.161 | 0.287 | 2.581 | 1.60 | 0.88–2.32 | 0.039 |
| Southwest China | −1.368 | 0.292 | 1.466 | 1.09 | 0.45–1.71 | 0.550 |
| Northeast China (control) | — — | — — | — — | — — | — — — — | — — |