Table 3.

Estimated odds ratios (OR) of marijuana class membership, in relation to early aggressive/disruptive behavior and suspected middle-school influences based on a longitudinal multinomial latent class regression model.

Variables	Marijuana Exposure Opportunity (Class 2) vs Little or No Involvement (Class 1)		Marijuana Use and Problems (Class 3) vs Little or No Involvement (Class 1)
	Model 1	Model 2	Model 1	Model 2
	OR (95% CI)	OR (95% CI)	OR (95% CI)	OR (95% CI)
Early Aggressive/Disruptive Behavior
Low	1.0	1.0	1.0	1.0
Moderate	0.9 (0.6, 1.4)	1.1 (0.7, 1.8)	2.9 (1.1, 8.1)	3.2 (1.2, 8.5)
High	1.6 (0.9, 2.7)	1.9 (1.1, 3.3)	2.8 (0.9, 8.5)	2.7 (1.0, 6.9)
Parent Monitoring
High	1.0	1.0	1.0	1.0
Moderate	1.3 (0.9, 2.0)	1.0 (0.7, 1.6)	3.4 (1.9, 5.9)	2.6 (1.3, 5.0)
Low	1.2 (0.8, 1.9)	0.8 (0.5, 1.4)	3.9 (2.4, 6.5)	1.9 (1.1, 3.5)
Deviant Peer Affiliation
Low	1.0	1.0	1.0	1.0
Moderate	1.8 (1.3, 2.5)	1.9 (1.4, 2.6)	2.1 (1.2, 3.6)	1.8 (1.0, 3.3)
High	3.7 (2.4, 5.8)	2.8 (1.9, 4.1)	10.9 (5.8, 20.6)	5.6 (3.0, 10.3)
Neighborhood Disadvantage
Low	1.0	1.0	1.0	1.0
Moderate	1.5 (1.0, 2.1)	1.3 (0.8, 2.3)	1.7 (0.9, 3.0)	1.4 (0.8, 2.6)
High	1.8 (1.1, 3.1)	1.4 (0.8, 2.4)	3.6 (1.9, 7.0)	2.1 (1.1, 4.0)

Model 1: association of early aggressive/disruptive behavior, parent monitoring, deviant peer affiliation, and neighborhood disadvantage with marijuana class membership estimated separately, with adjustment for grade; Model 2: association of early aggressive/disruptive behavior, parent monitoring, deviant peer affiliation, and neighborhood disadvantage with marijuana class membership estimated simultaneously, with adjustment for grade, gender, subsidized-lunch status and intervention group.