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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: J Safety Res. 2012 Jan 24;43(1):75–82. doi: 10.1016/j.jsr.2011.12.001

Table 3.

Relationship of Demographic Variables to Driving and Crash Involvement (Alcohol Related or Not).

Self-reports of
demographic variables		 Comparison # 1
 Comparison # 2
 Comparison # 3
 Comparison # 4
 Comparison # 5
Control BAC≥.05
versus
Control BAC=.00
 Crash BAC=.00
versus
Control BAC=.00
 Crash BAC≥.05
versus
Control BAC≥.05
 Crash BAC≥.05
versus
Crash BAC=.00
 Crash BAC≥.05
versus
Control BAC=.00
Odds P>z Odds P>z Odds P>z Odds P>z Odds P>z
Male 2.622 0.000 0.830 0.000 0.902 0.535 2.849 0.000 2.364 0.000
Female
Age: <21 0.253 0.000 1.591 0.000 1.784 0.138 0.284 0.000 0.451 0.001
Age: 21–24 0.835 0.290 1.241 0.002 1.018 0.940 0.684 0.027 0.849 0.321
Age: 55+ 0.722 0.067 1.198 0.007 1.062 0.800 0.640 0.009 0.767 0.106
Age: 25–54
African American 0.788 0.073 0.925 0.175 0.784 0.188 0.668 0.004 0.618 0.000
Hispanic 0.743 0.033 0.813 0.001 0.944 0.758 0.862 0.294 0.702 0.008
Other 0.360 0.000 1.221 0.001 1.432 0.166 0.423 0.000 0.516 0.000
White
<12 years school 1.076 0.626 1.277 0.000 1.501 0.035 1.266 0.084 1.616 0.000
15 + years school 0.708 0.002 0.929 0.124 1.007 0.967 0.767 0.024 0.712 0.002
12–14 years school
Employed 1.099 0.453 0.798 0.000 0.796 0.165 1.096 0.435 0.875 0.237
Single 1.537 0.000 1.055 0.291 1.110 0.521 1.617 0.000 1.705 0.000
Separated 1.865 0.000 1.152 0.029 0.920 0.679 1.491 0.009 1.717 0.000
Married
One or more passengers 1.428 0.000 1.020 0.651 0.486 0.000 0.680 0.000 0.694 0.000
Single-vehicle crash 0.847 0.362 0.812 0.007 1.522 0.064 1.589 0.003 1.289 0.085
Multiple-vehicle crash
Miles driven 1.03 0.190   .99 0.388 1.09 0.008 1.12 0.000   .89 0.000
Pseudo R2 0.045 0.016 0.042 0.072 0.046

Comparisons #1 through #5 were obtained by running a single multilogistic model twice, each time applying a different reference group. For comparisons #1 and #2, the reference group was control drivers with a BAC=.00. For comparison #4, the reference group was crash drivers with BAC≥.05. For comparisons #3 and #5, the reference group included crash drivers with a BAC≥.05. In comparison #1, no crash is involved; therefore, crash severity (“Some Injury” and “PDO”) is that of the matching crashes. Pseudo R2 for this single model is=.0277.