Table 5.

Odds Ratios (and 95% Confidence Limits) from Multilevel Multinomial Logistic Models of Participant’s Alcohol and Cannabis Use from the Proportion of Friends with whom they Drink (i.e., Drinking Buddies) and Participant Demographic Covariates (n = 1817)

	Concurrent vs. Alcohol Only			Simultaneous vs. Alcohol Only
		95% Confidence Limits			95% Confidence Limits
Variable	OR	Lower	Upper	OR	Lower	Upper
Intercept	0.24	0.14	0.40	0.78	0.52	1.17
Semester	1.81	1.31	2.50	1.09	0.83	1.43
Female Sex	0.71	0.49	1.02	0.41	0.28	0.60
Non-Hispanic White	0.82	0.57	1.18	0.89	0.62	1.29
Athlete	0.29	0.16	0.52	0.22	0.13	0.37
Substance-free Dorm	0.10	0.03	0.36	0.19	0.08	0.49
Greek Intentions (Maybe)	0.92	0.62	1.37	1.94	1.30	2.90
Greek Intentions (Yes)	0.70	0.30	1.60	2.66	1.31	5.43
Proportion Drinking Buddies	2.00	1.15	3.47	16.62	9.17	30.15

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.” Participants could not identify cannabis-use buddies if they did not use cannabis themselves. Thus, “Proportion Friend Cannabis Users” would not apply to the “Alcohol Only” category and was only relevant for the Simultaneous vs. Concurrent comparison (see Table 6).

Note: The difference in the n between Tables 4 and 5 reflects missingness on the proportion of drinking buddies variable.