. Author manuscript; available in PMC: 2016 Feb 15.

Published in final edited form as: Accid Anal Prev. 2014 Jul 23;72:146–160. doi: 10.1016/j.aap.2014.05.024

Table 1.

Predictors used in the Regression Models

Predictor	Level
Age (yr)	Continuous
Gender	Male (reference), female
BMI (kg/m²), BMI²	Continuous
deltaV (km/h)	Continuous
Vehicle type	Passenger car (reference), light truck, utility vehicle, van
Belt use	Unbelted (reference), belted 3pt, belted other^*
Seat location	Driver (reference), passenger
Height (cm)	Continuous
# of Quarter Turns (Rollover only)	Categorical (1-2, 3-6, 7-10, 11-13, >13)
Multiple Severe Impacts^**	No (reference), Yes
Position of occupant relative to direction of roll	Same side (reference), Opposite side.
L-Type/T-Type (Near-/Farside Impacts Only)	T-Type (reference), L-Type

Belted other refers to either a 3-point belt that is improperly used or older non 3 point seatbelts (e.g. lapbelts)

^**

For multiple severe impacts, the second impact must have been clearly distinguishable from the first impact, and the more severe impact was included for the regression analysis.