Table 4.

Adjusted relative risk ratios from multivariable multinomial logistic regressions of latent class membership on covariates: Comparisons with the SAM^a-Heavier Use class

	SAM-Lighter Use		Concurrent Use		Alcohol-Only Use
	(vs. SAM-Heavier)		(vs. SAM-Heavier)		(vs. SAM-Heavier)
	ARRb	p	ARR	p	ARR	p
Gender (ref = female)
Male	0.28	<.001	0.29	<.001	0.27	<.001
Race/Ethnicity (ref = White)
Black/African American	3.50	<.001	6.11	<.001	3.64	<.001
Hispanic	1.29	0.067	1.79	<.001	1.62	<.001
Other Races	1.43	0.005	1.86	<.001	1.73	<.001
Parent Education (ref = high school or less)
Some college	0.96	0.523	0.87	0.028	0.81	<.001
High school grades (ref = B- or better)
C+ or worse	0.87	0.030	0.94	0.331	0.62	<.001
Four-year college graduation plans (ref = no definite plans to graduate)
Definitely plan to graduate	1.22	0.004	1.15	0.038	1.33	<.001
Evenings out (ref = fewer than 3)
Three or more evenings out/week	0.37	<.001	0.33	<.001	0.25	<.001
Truancy (ref = no cutting class in past month)
Any classes cut in past month	0.50	<.001	0.43	<.001	0.26	<.001
Illicit drug use other than marijuana (IOTM) (ref = no past 12-month use)
Any past 12-month IOTM use	0.16	<.001	0.09	<.001	0.02	<.001
Cohort (ref = 2006-2016)
1976-1985	0.39	<.001	0.33	<.001	0.43	<.001
1986-1995	0.67	<.001	0.46	<.001	1.12	0.293
1996-2005	0.58	<.001	0.52	<.001	0.69	0.001

Notes: Unweighted N=84,805. All covariates entered simultaneously and included missing data indicators; estimates for missing indicators not shown. Bold entries represent associations significant at p < .01.

^aSAM = simultaneous alcohol and marijuana use.

^bARR = Adjusted risk ratio.