Table 4.

Generalized linear models predicting fraternity membership and substance use outcomes from stimulant misuse groupings and control variables.

	Outcomes

	Fraternity/Sorority Membership			Tobacco Use			Marijuana Use			Binge Drinking

Predictors	Odds Ratios	CI	p	Odds Ratios	CI	p	Odds Ratios	CI	p	Odds Ratios	CI	p
Intercept	0.65	0.40 – 1.06	0.082	1.11	0.68 – 1.82	0.668	1.45	0.88 – 2.39	0.149
Response category intercepts (ordinal binge drinking only)
(Intercept: 0\|1)										0.11	0.07 – 0.17	<0.001
(Intercept: 1\|2)										0.31	0.21 – 0.46	<0.001
(Intercept: 2\|3)										0.61	0.41 – 0.91	0.015
(Intercept: 3\|4)										1.06	0.71 – 1.56	0.788
(Intercept: 4\|5)										2.96	1.99 – 4.41	<0.001
(Intercept: 5\|6)										12.96	8.41 – 19.95	<0.001
Demographics
Race
Asian American	0.72	0.50 – 1.04	0.08	0.5	0.35 – 0.72	<0.001	0.64	0.43 – 0.95	0.027	0.49	0.38 – 0.65	<0.001
African American	0.48	0.32 – 0.71	<0.001	0.75	0.54 – 1.04	0.086	1.38	0.98 – 1.94	0.065	0.55	0.43 – 0.70	<0.001
Hispanic/Latino	1.01	0.63 – 1.62	0.958	0.65	0.39 – 1.07	0.093	0.97	0.58 – 1.63	0.913	0.74	0.51 – 1.08	0.122
Male	0.95	0.74 – 1.23	0.703	3.17	2.49 – 4.02	<0.001	2	1.55 – 2.59	<0.001	1.97	1.63 – 2.37	<0.001
Year in school	0.96	0.87 – 1.07	0.494	0.93	0.84 – 1.03	0.172	0.91	0.82 – 1.02	0.105	1.11	1.03 – 1.20	0.01
Study effects
MFS vs. REAL-U	1.72	1.33 – 2.21	<0.001	0.79	0.62 – 1.00	0.052	0.77	0.60 – 1.00	0.054	1.21	1.00 – 1.45	0.046
Test Form B	0.93	0.65 – 1.32	0.665	0.67	0.46 – 0.96	0.029	0.96	0.68 – 1.37	0.84	0.97	0.73 – 1.31	0.861
Stimulant misuse groupings
Main effects
Other hard drugs only	0.68	0.38 – 1.20	0.183	1.31	0.74 – 2.31	0.347	1.3	0.74 – 2.26	0.362	1.19	0.74 – 1.92	0.464
Both stimulants and other hard drugs	1.67	1.04 – 2.68	0.035	4.33	2.45 – 7.67	<0.001	3.1	1.82 – 5.29	<0.001	3.21	2.13 – 4.83	<0.001
Neither stimulants nor other hard drugs	0.36	0.25 – 0.53	<0.001	0.34	0.23 – 0.51	<0.001	0.17	0.12 – 0.25	<0.001	0.25	0.18 – 0.34	<0.001
Interactions with test form
Other hard drugs only	0.91	0.51 – 1.59	0.729	1.45	0.82 – 2.54	0.199	1.12	0.65 – 1.95	0.682	0.88	0.55 – 1.42	0.601
Both stimulants and other hard drugs	1.11	0.69 – 1.78	0.664	1.67	0.95 – 2.96	0.077	0.91	0.53 – 1.55	0.73	0.9	0.61 – 1.35	0.613
Neither stimulants nor other hard drugs	1.07	0.73 – 1.58	0.713	1.44	0.98 – 2.12	0.066	1.01	0.69 – 1.48	0.96	0.96	0.70 – 1.31	0.78

Observations			1534			1534			1534			1534
Tjur’s R²			0.095			0.224			0.259			0.281