Table 3.

Logistic Regression Results from the LTCCS

Parameter	Estimate	Standard Error	Chi-Square Statistic	P-value
Intercept	−0.90	0.25	13.42	0.000
Fatal injury in vehicle	−0.19	0.19	0.97	0.324
AIS 4–5 injury in vehicle	−0.40	0.34	1.39	0.239
AIS 3 injury in vehicle	−0.32	0.25	1.69	0.194
AIS 2 injury in vehicle	−0.05	0.20	0.06	0.805
AIS 1 injury in vehicle	−0.01	0.12	0.00	0.957
Reported alcohol use by driver	−0.55	0.32	2.92	0.088
Male driver	−0.14	0.13	1.05	0.305
Driver’s age under 21	−0.12	0.22	0.29	0.591
Night	0.10	0.13	0.66	0.416
Dawn/dusk	0.79	0.22	12.75	0.000
Speeding 5–10 MPH	0.59	0.37	2.51	0.113
Speeding 11–20 MPH	−0.26	0.53	0.24	0.624
Speeding over 20 MPH	−0.59	0.59	0.99	0.321
Speeding unknown	0.17	0.11	2.49	0.115
Speed limit over 44 MPH	−0.13	0.13	0.96	0.327
Divided highway, no barrier	−0.02	0.16	0.01	0.921
Divided highway with barrier	0.43	0.15	8.49	0.004
One-way street	0.44	0.24	3.30	0.070
Intersection	−0.73	0.17	18.56	<.0001
Interchange	−0.07	0.19	0.12	0.726
Other juncture	0.53	0.17	9.34	0.002
Driveway	−0.50	0.32	2.40	0.122
Rear-end collision	0.15	0.15	1.03	0.309
Head-on collision	0.09	0.23	0.16	0.686
Angle collision	−0.28	0.15	3.66	0.056
Sideswipe same direction	0.05	0.24	0.04	0.832
Sideswipe opposite direction	−1.29	0.64	4.11	0.043
Collision with shrubbery/embankment	−0.52	0.52	1.02	0.313
Collision with small tree/ breakaway pole/ ditch/ culvert/ fire hydrant	0.08	0.29	0.07	0.785
Collision with fence/wall/building	−0.23	0.35	0.41	0.522
Collision with traffic barrier	0.10	0.15	0.43	0.512
Collision with curb	−1.65	0.77	4.59	0.032

No. of observations: 2,258; Likelihood Ratio: 166.8, Pr > ChiSq <.0001;

Score: 158.4, Pr > ChiSq <.0001; Wald: 144.2, Pr > ChiSq <.0001