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

European Transport Research Review

An Open Access Journal

Table 3 Average pseudo-elasticities for the partial proportional odds model

Explanatory variables	PDO		Injury		Fatality
Explanatory variables	%	p	%	p	%	p
Driver characteristics
Male	2.76	n.s.	−1.27	n.s.	−1.49	n.s.
Age
Adult (30~50 years)	−1.03	n.s.	0.47	n.s.	0.55	n.s.
Old (> 50 years)	−5.94	0.008	2.74	0.014	3.21	0.008
Failure to wear a seatbelt	−11.72	< 0.001	9.87	< 0.001	1.85	n.s.
Vehicle attributes
Multiple vehicles involved	−6.96	< 0.001	6.66	0.002	0.29	n.s.
Commercial transport	13.53	< 0.001	−6.23	0.002	−7.30	< 0.001
Overloading	−14.71	< 0.001	1.13	n.s.	13.58	< 0.001
Brake Failure	−4.84	0.011	6.55	0.006	−1.72	n.s.
Disregarding speed limit	−10.11	< 0.001	−1.70	n.s.	11.81	< 0.001
Unsafe following distance	−10.09	< 0.001	8.90	< 0.001	1.18	n.s.
Road geometrics
Curve	−4.36	0.005	−3.21	n.s.	7.57	< 0.001
Vertical alignment
Upgrade	4.33	n.s.	−1.99	n.s.	−2.34	n.s.
Downgrade	15.70	< 0.001	−11.56	< 0.001	−4.14	< 0.001
Environmental conditions
Season
Summer	−10.23	< 0.001	4.71	< 0.001	5.52	< 0.001
Autumn	6.80	0.020	−14.73	< 0.001	7.93	0.007
Winter	−11.24	< 0.001	−0.21	n.s.	11.45	< 0.001
Weekday	3.22	0.021	−1.48	0.030	−1.74	0.022
Nighttime	−10.45	< 0.001	1.35	n.s.	9.09	< 0.001
Adverse weather	−11.01	< 0.001	1.59	n.s.	9.41	< 0.001