Table 4.

Odds Ratios (and 95% Confidence Limits) from Multilevel Multinomial Logistic Models of Participant’s Alcohol and Cannabis Use by the Proportion of their Friends Who Drink/Use and Participant Demographic Covariates (n = 1861)

	Concurrent vs. Alcohol Only			Simultaneous vs. Alcohol Only			Simultaneous vs. Concurrent
		95% Confidence Limits			95% Confidence Limits			95% Confidence Limits
Variable	OR	Lower	Upper	OR	Lower	Upper	OR	Lower	Upper
Intercept	0.20	0.12	0.34	0.43	0.28	0.65	1.75	1.12	2.72
Semester	1.57	1.13	2.17	0.87	0.66	1.16	0.58	0.42	0.82
Female Sex	0.77	0.54	1.11	0.51	0.36	0.74	0.72	0.49	1.05
Non-Hispanic White	0.91	0.63	1.32	0.97	0.68	1.39	1.07	0.73	1.57
Athlete	0.44	0.25	0.77	0.44	0.26	0.74	1.05	0.56	1.96
Substance-free Dorm	0.14	0.05	0.45	0.26	0.10	0.65	1.81	0.50	6.58
Greek Intentions (Maybe)	1.01	0.68	1.50	1.95	1.32	2.86	1.76	1.16	2.65
Greek Intentions (Yes)	0.71	0.31	1.65	2.76	1.39	5.50	3.31	1.44	7.60
Proportion Friend Drinkers	0.43	0.20	0.95	1.54	0.66	3.62	3.22	1.24	8.34
Proportion Friend Cannabis Users	12.72	6.86	23.59	91.15	47.80	173.80	5.98	3.02	11.85

Note. 95% confidence limits with bounds outside of 1.00 are reported in bold typeface. The reference value for Semester is “Fall.” The reference value for Greek Intentions is “No.”

Note: The n refers to the total number of observations used in this analysis. We used listwise deletion based on predictor variables, so if any covariate or focal predictor is missing, it is removed from the analysis.