Table 2.

Effect of daily co-use of alcohol and marijuana relative to single substance use on daily consequences

	Daily Consequences
	Co-use versus Alcohol Only (n=328)					Co-use versus Marijuana Only (n=314)
	95% CI					95% CI
Predictors	β	Low	High	SE	p	β	Low	High	SE	p
Intercept	−0.074	−0.560	0.415	.253	−	0.023	−0.393	0.442	.217	-
Level 2 (Person)
Male	−0.102	−0.166	−0.038	.033	.002	−0.051	−0.107	0.005	.029	.078
Non-white	0.039	−0.039	0.118	.041	.337	0.011	−0.058	0.080	.036	.756
Hispanic/Latino	0.001	−0.110	0.112	.058	.983	0.008	−0.088	0.103	.049	.869
Age	0.013	−0.011	0.036	.012	.303	−0.002	−0.023	0.019	.011	.851
School (A)	−0.046	−0.122	0.032	.040	.255	−0.020	−0.090	0.050	.036	.578
School (B)	0.058	−0.018	0.134	.040	.143	0.089	0.020	0.157	.036	.013
AUDIT	0.012	0.006	0.019	.003	<.001	0.009	0.003	0.014	.003	.002
CUDIT-R	0.004	−0.002	0.010	.003	.160	0.000	−0.005	0.005	.003	.982
Level 1 (Day)
Any daily nicotine	0.028	−0.027	0.082	.028	.322	0.040	0.002	0.077	.019	.037
Any daily other drugs	0.106	0.018	0.195	.045	.019	0.111	0.054	0.167	.029	<.001
Non-plant	0.021	−0.045	0.087	.034	.541	0.020	−0.012	0.052	.017	.223
Weekend	0.095	0.055	0.136	.021	<.001	0.088	0.061	0.114	.014	<.001
# drinks	0.080	0.073	0.087	.004	<.001
# marijuana uses						0.004	0.001	0.008	.002	.009
Daily co-use	−0.019	−0.085	0.048	.034	.584	0.243	0.215	0.271	.014	<.001
# drinks * daily co-use	−0.039	−0.048	−0.029	.005	<.001
# marijuana * daily co-use						0.000	−0.005	0.004	.002	.815

Note. AUDIT= Alcohol Use Disorders Identification Test; CUDIT-R=Cannabis use Disorder Identification Test Revised. ICCs for subject-level clustering of consequences were .15 and .18, respectively, in data comparing co-use to alcohol only (left panel) and marijuana only (right panel).