Table 3.

Multilevel Models Assessing Engagement in Risky Activities Predicting Odds of SAM Use, by <21 and 21+ Years

			Total Sample	< 21 Years Old	21 Years and Older
			(n = 594 days)	(n = 302 days)	(n = 292 days)
Model 1	Level 1	Intercept	0.33 [0.16, 0.67]**	0.32 [0.12, 0.89]*	0.35 [0.12, 1.02]
		Pre-gaming	1.17 [0.68, 2.02]	1.16 [0.55, 2.44]	1.23 [0.54, 2.80]
		Weekend	0.99 [0.61, 1.59]	0.57 [0.28, 1.15]	1.59 [0.81, 3.11]
	Level 2	Prop. Pre-gaming	1.51 [0.45, 5.11]	3.53 [0.68, 18.23]	0.54 [0.07, 3.95]
		Sex	1.58 [0.77, 3.24]	1.99 [0.75, 5.27]	1.32 [0.42, 4.19]
Model 2	Level 1	Intercept	0.42 [0.23, 0.78]**	0.69 [0.30, 1.62]	0.26 [0.10, 0.69]**
		Drinking Games	0.93 [0.50, 1.74]	0.98 [0.44, 2.19]	0.82 [0.29, 2.29]
		Weekend	1.05 [0.65, 1.68]	0.66 [0.33, 1.31]	1.62 [0.82, 3.18]
	Level 2	Prop. Drinking Games	0.73 [0.15, 3.47]	0.31 [0.04, 2.21]	3.24 [0.16, 66.73]
		Sex	1.60 [0.78, 3.29]	2.09 [0.79, 5.49]	1.30 [0.41, 4.09]

Note. Separate logistic multilevel models predict the odds of engaging in SAM use on a given day compared to days in which they used alcohol but not marijuana; results reflect odds ratios. Models were conducted separately for those under 21 years and 21+ years old. Weekends (Thursdays through Saturdays) were coded as 1 and weekdays (Sundays through Wednesdays) were coded as 0.

^**p < .01;

^*p < .05