A Comprehensive Analysis for the Heterogeneous Effects on Driver Injury Severity in Single-Vehicle Passenger Car and SUV Rollover Crashes

Table 6

Comparison of selected variable marginal effects (%).

Variables	Passenger car		SUV		Difference sign
	NII	SI	NII	SI	NII	SI
Male	−13.05	−1.53	−19.63	−2.18
Safety belt use	−20.34	−3.01	−30.55	−5.28
Airbag deployment	17.36	2.12	6.92	0.73
Ejection or partial ejection	29.59	44.05	30.73	41.54
Drug or alcohol use	17.55	2.54	11.05	1.3
Failure to drive in single lane	6.55	0.77	12.48	1.45
Model year	−0.27	−0.03	−0.88	−0.09
Speed limit	0.32	0.04	0.46	0.05
Adverse weather	−9.26	−0.93	−10.12	−0.93
Rural area	−7.99	−0.92	−7.13	−0.75

The difference sign is “” if the absolute value of marginal effects in SUV model is greater than that in passenger car model and “”otherwise. For instance, for male variable specified to SI, the absolute values of marginal effects in passenger car and SUV models are 1.53% and 2.18%, where 2.18% is greater than 1.53%. Thus, the different sign is “”.