Table 4.

Estimated odds ratios (OR) of marijuana class membership, in relation to early aggressive/disruptive behavior and suspected middle school influences by grade, 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)
	6^th Grade	7^th Grade	8^th Grade	6^th Grade	7^th Grade	8^th Grade
	OR (95% CI)	OR (95% CI)	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	1.0	1.0
Moderate	2.2 (1.1, 4.4)	1.1 (0.6, 2.2)	0.9 (0.4, 1.9)	1.5 (0.2, 9.4)	4.0 (1.4, 11.3)	3.1 (1.2, 8.2)
High	2.7 (1.2, 6.3)	2.4 (1.1, 5.2)	1.7 (0.9, 3.4)	0.8 (0.1, 6.2)	2.9 (0.9, 9.6)	3.5 (1.4, 8.3)

Parent monitoring
High	1.0	1.0	1.0	1.0	1.0	1.0
Moderate	1.6 (0.9, 2.9)	0.6 (0.3, 1.1)^*	0.9 (0.5, 1.6)	50.0 (7.3, 342.8)	3.8 (1.3, 10.9)^*	1.4 (0.6, 3.7)^*
Low	1.7 (0.9, 3.5)	0.7 (0.4, 1.3)^*	0.6 (0.3, 1.3)^*	25.3 (4.7, 135.6)	2.3 (0.7, 7.4)^*	1.5 (0.6, 3.6)^*

Deviant peer affiliation
Low	1.0	1.0	1.0	1.0	1.0	1.0
Moderate	4.6 (1.7, 12.9)	1.8 (1.0, 3.2)	1.9 (1.1, 3.3)	1.3 (0.1, 14.9)	1.4 (0.5, 3.5)	2.3 (1.0, 5.3)
High	10.0 (3.3, 30.3)	1.6 (0.7, 3.4)^*	3.0 (1.6, 5.8)	3.2 (0.3, 37.5)	5.0 (2.2, 11.4)	6.1 (2.9, 13.1)

Neighborhood disadvantage
Low	1.0	1.0	1.0	1.0	1.0	1.0
Moderate	1.6 (0.6, 4.3)	1.4 (0.7, 2.8)	1.0 (0.4, 2.2)	4.8 (1.3, 17.8)	1.5 (0.5, 4.4)	1.0 (0.4, 2.1)^*
High	3.7 (1.6, 8.4)	1.4 (0.6, 3.2)	0.9 (0.5, 1.6)^*	2.8 (0.4, 18.0)	2.3 (0.8, 6.2)	1.6 (0.7, 4.0)

Indicates the estimate is significantly different at the 0.05 level from the sixth grade estimate.