Table 1.

Parameter Estimates from regression models examining associations between risky driving behaviors and substance use

	Overall risky driving behavior scorea		Driving after having too much to drink to drive		Driving within 3 hours of using marijuanaa
	n =490		safely n = 497		n = 496
	β (SE)	p value	OR (95% CI)	p value	OR (95% CI)	p-value
Age	0.20(0.22)	0.3599	1.15(0.89-	0.2955	0.85 (0.71-	0.0742
Gender
Male	(ref)		(ref)		(ref)
Female	−1.43	0.0653	0.79 (0.33-	0.5981	0.60 (0.33-	0.0932
Substance Use
Alcohol-	(ref)		(ref)		(ref)
only/mar ijuana-
Concurrent alcohol and	−0.45 a. 14)	0.6899	2.12(0.63–7.10)	0.2255	9.13 (3.43–24.30)	<0.0001
Simultaneous alcohol	3.19 (0.94)	0.0007	3.00 (1.15–7.87)	0.0253	29.28 (12.62–67.90)	<0.0001

^aMale>female, p<0.05

^bFemale>male, p<0.05