Table 3.

Summary of logistic regression analysis for variables predicting younger siblings’ marijuana use (n = 324)

	Model 1			Model 2
Variable	B	OR	[95% CI]	B	OR	[95% CI]
Intercept	−3.42***			−3.66***
Family structure	0.67	1.95	[0.92,4.16]	0.66	1.93	[0.88, 4.20]
Parental knowledge	−0.80*	0.49	[0.22, 0.93]	−0.87*	0.42	[0.20, .89]
Sibling intimacy	0.09	1.10	[0.49, 2.45]	0.05	1.05	[0.46, 2.40]
Sibling conflict	0.52	1.68	[0.93, 3.06]	0.55	1.74	[0.95,3.18]
Sibling’s marijuana use (sib. marij.)	1.87***	6.50	[2.97, 14.22]	2.15***	8.61	[3.60, 20.59]
Shared friends (shr. fr.)	−0.15	0.86	[0.54, 1.37]	−0.60	0.55	[0.25, 1.21]
Sib modeling (mod.)	0.03	1.03	[0.55, 1.95]	−0.12	0.89	[0.31,2.51]
Sib. Marij. × Mod.				0.41	1.51	[0.46, 4.94]
Sib. Marij. × Shr. Fr.				0.97*	2.63	[1.00, 6.93]
Mod. × Shr. Fr.				0.53	1.70	[0.95, 3.05]
χ2		50.39			61.01**
df		11			14

Notes: Nonsignificant controls omitted from table: parental education, sex composition, age spacing, and gender. OR = odds ratio.

^*p<.05;

^**p<.01;

^***p < .001.