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. 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 4.

Distribution of Key Predictors for NASS-CDS Dataset by gender

Gender Rao-Scott Chi Square
F M
deltaV (kph), Frontal Impacts ΔV <15 30% 29% X2(3)=6.2, p=0.10
15≤ΔV <30 56% 52%
30≤ ΔV <45 12% 16%
ΔV > 45 2% 3%
deltaV (kph), Nearside Impacts ΔV <15 47% 53% X2(3)=1.61 p=0.66
15≤ΔV <30 44% 38%
30≤ ΔV <45 7% 8%
ΔV > 45 2% 1%
deltaV (kph), Farside Impacts ΔV <15 45% 55% X2(3)=13.6 p=0.003
15≤ΔV <30 46% 35%
30≤ ΔV <45 8% 8%
ΔV > 45 1% 2%
N Quarter Turns (Rollover only) 1-2 56% 52%
3-6 39% 44%
7-10 5% 4%
11-13 0% 0%
>13 0% 0%
Age Gp (yrs) 15-24 31% 31% X2(4)=4.7, p=0.31
25-44 37% 37%
45-64 23% 22%
65-74 5% 5%
≥75 4% 5%
Belt Use 3-point 92% 88% X2(1)=4.5, p<0.0001
No 8% 12%
Seat Location Driver 80% 86% X2(1)=59.3, p<0.0001
Passenger 20% 14%
Multiple Severe Impacts No 92% 88% X2(1)=1.59, p=0.21
Yes 8% 12%
Vehicle Type Car 65% 54% X2(3)=108.9 p<0.0001
Pickup 5% 24%
Utility 22% 16%
Van 8% 6%
Crash Mode Farside 14% 12% X2(3)=15.3, p=0.0014
Frontal 64% 57%
Nearside 13% 15%
Rollover 9% 16%
Model Year 2000-2002 35% 38% X2(4)=5.3, p=0.15
2003-2005 53% 47%
2006-2008 10% 13%
2009-2011 2% 2%
BMI BMI < 18.5 4% 1% X2(4)=240.9, p<0.0001
18.5≤BMI<25 47% 25%
25<BMI≤30 31% 54%
30<BMI≤35 11% 14%
BMI>35 7% 6%

* X2(n): The number n in parentheses refers to the number of degrees of freedom.