Table 2.

Logistic regression coefficients (standard errors) in models for risk of driver fatalities and driver involvement in single-vehicle crashes, in two-vehicle crashes, and in all crashes as a function of variables for age, gender, and BAC. Data are from the 2006–2007 FARS and 2007 National Roadside Survey.

Variable	Single-vehicle crashes		Two-vehicle crashes		All crashes
	Fatalities	Involvements	Fatalities	Involvements	Fatalities	Involvements
Main effects
Intercept	−2.595 (0.205)	−2.234 (0.202)	−2.996 (0.207)	−1.982 (0.208)	−2.021 (0.210)	−1.251 (0.209)
Female	−0.786 (0.078)	−0.371 (0.066)	−0.159 (0.070)	−0.332 (0.064)	−0.496 (0.068)	−0.287 (0.065)
Age (ref. = 21–34)
Age 16−20	1.138 (0.084)	0.946 (0.089)	0.673 (0.085)	0.697 (0.084)	0.968 (0.083)	0.773 (0.084)
Age ≥35	−0.231 (0.078)	−0.119 (0.064)	0.289 (0.064)	−0.050 (0.060)	0.079 (0.062)	−0.040 (0.059)
BrAC	0.035 (0.003)	0.028 (0.003)	0.025 (0.002)	0.022 (0.003)	0.031 (0.002)	0.024 (0.003)
Interactions
0< BrAC <.019, age ≥ 21	−0.538 (0.166)	−1.570 (0.197)	−1.597 (0.161)	−1.254 (0.168)	−0.911 (0.165)	−1.481 (0.174)
Age 16−20, BrAC	0.004 (0.005)	0.005 (0.005)	0.004 (0.005)	0.003 (0.005)	0.004 (0.005)	0.004 (0.005)
Age 21−34, BrAC (ref.)
Age ≥35, BrAC	−0.001 (0.004)	−0.004 (0.004)	−0.001 (0.003)	−0.001 (0.004)	−0.003 (0.003)	−0.003 (0.004)
Max-rescaled R2	.7192	.3734	.3756	.2645	.6355	.3215

Notes: Coefficients marked in bold are not significant (5%). The “Involvement” categories include drivers who were involved in a fatal vehicle crash but were not fatally injured. BAC = blood alcohol concentration; FARS = U.S. Fatality Analysis Reporting System; BrAC (breath alcohol concentration) is the rescaled BAC: BrAC = BAC × 1000. Ref. = reference group: Men ages 21–34 years. Age ≥ 21 refers to ages 21 and older.