Table 4.

Adjusted odds ratios with 95% confidence intervals from multivariable logistic regressions comparing drunk driving, social consequences, and harms to self among simultaneous vs. concurrent alcohol/cannabis users, controlling for demographic variables

	Alcohol-Related Problem Outcomes
Predictors	Drunk driving	Consequences	Harms
Simultaneous use (vs. Concurrent use)	2.04 (1.07, 3.89)*	1.62 (0.75, 3.52)	1.67 (0.85, 3.31)
Gender  Male (vs. Female)	0.94 (0.54, 1.62)	0.77 (0.41, 1.41)	1.09 (0.61, 1.94)
Age (vs. 18–29)  30–49  50+	1.05 (0.56, 1.97) 1.39 (0.65, 2.98)	0.85 (0.43, 1.70) 0.41 (0.16, 1.03)	0.73 (0.40, 1.33) 0.50 (0.23, 1.09)
Race/ethnicity (vs. White)  African American  Hispanic  Other	0.75 (0.33, 1.73) 1.70 (0.67, 4.30) 0.99 (0.26, 3.82)	2.06 (0.87, 4.89) 1.62 (0.59, 4.42) 0.67 (0.20, 2.20)	2.39 (1.08, 5.29)* 1.34 (0.51, 3.52) 1.80 (0.57, 5.67)
Education (vs. < High school)  HS graduate	7.26 (1.33, 39.59)*	1.03 (0.27, 3.91)	1.13 (0.36, 3.57)
Employment (vs. Unemployed)  Employed	2.98 (1.64, 5.40)*	1.15 (0.59, 2.22)	0.51 (0.28, 0.92)*
Relationship status (vs. Partnered)  Not partnered	1.85 (1.01, 3.37)*	1.16 (0.63, 2.12)	0.88 (0.49, 1.58)
Five or more drinks in a day (vs. Never)  Less than monthly in past year  Monthly or more frequent in past year	2.19 (1.07, 4.50)* 3.32 (1.35, 8.17)*	1.87 (0.71, 4.91) 2.62 (0.90, 7.58)	3.33 (1.51, 7.34)* 4.61 (1.79, 11.90)*
Average daily # drinks	1.15 (1.02, 1.28)*	1.45 (1.28, 1.63)*	1.32 (1.17, 1.49)*
Cannabis use frequency (vs. weekly or more)  1×/2–3 weeks  1×/1–2 months  Less often than 1×/1–2 months	1.58 (0.61, 4.06) 0.96 (0.43, 2.17) 0.83 (0.45, 1.54)	1.49 (0.54, 4.06) 1.91 (0.76, 4.77) 1.54 (0.71, 3.36)	0.76 (0.32, 1.84) 2.13 (0.96, 4.75) 1.46 (0.74, 2.88)

^*P < .05

Concurrent users n = 248; Simultaneous users n = 449