Table 2.

Relationship of Traffic-related Conditions to Driving and Crash Involvement (Alcohol Related or Not).

	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
Road condition	0.814	0.520	0.948	0.684	1.136	0.756	0.976	0.936	0.925	0.786
Bad weather	1.113	0.717	0.992	0.948	0.900	0.707	0.626	0.023	1.155	0.594
Clear
Dark	0.713	0.096	1.024	0.694	1.037	0.923	1.164	0.589	0.641	0.028
Daylight
4 p.m. – 7 p.m.	0.804	0.268	1.089	0.196	0.662	0.121	0.489	0.000	0.532	0.001
9 p.m. – midnight	1.572	0.004	0.892	0.090	0.967	0.869	1.705	0.000	1.521	0.002
Midnight – 3 a.m.	3.555	0.000	0.788	0.024	0.687	0.101	3.100	0.000	2.443	0.392
7 p.m. – 9 p.m.
Some injury	0.854	0.250	0.882	0.019	1.055	0.762	1.022	0.865	0.901	0.096
PDO
Trip origin:
Bar	2.633	0.000	0.928	0.466	1.338	0.184	3.794	0.000	3.522	0.000
Other's home	1.638	0.003	1.428	0.000	1.395	0.122	1.601	0.003	2.286	0.000
Work	0.602	0.004	1.074	0.212	1.277	0.301	0.715	0.050	0.768	0.112
Other	1.101	0.581	1.424	0.000	1.038	0.876	0.803	0.220	1.143	0.443
Own home
Single-vehicle crash	0.962	0.843	0.891	0.166	1.341	0.229	1.447	0.032	1.289	0.117
Multiple-vehicle crash
Miles driven	1.01	0.703	.98	0.067	1.09	0.006	1.07	0.020	0.93	0.003
Site	0.037	0.581	0.401	0.000	1.600	0.876	0.149	0.220	0.060	0.443
Pseudo R2	0.084		0.007		0.020		0.142		0.104

Comparisons #1 through #5 were obtained by running a single multilogistic model twice, each time applying a different reference group. For comparisons #1, #2, and #5, the reference group was control drivers with a BAC=.00. For comparisons #3 and #5, the reference group included crashed 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.