Table 2.

Summary of logistic regression analysis for variables predicting younger siblings’ cigarette use (n = 322)

	Model 1			Model 2
Variable	B	OR	[95% CI]	B	OR	[95% CI]
Intercept	−2 72***			−2.90***
Family structure	1.05**	2.87	[1.36,6.04]	1.10**	2.99	[1.40,6.37]
Parental knowledge	−0.97**	0.38	[0.18,0.79]	−0.99**	0.37	[0.18,0.78]
Sibling intimacy	0.29	1.34	[0.58,3.10]	0.29	1.34	[0.57,3.18]
Sibling conflict	−0.02	0.98	[0.54, 1.76]	0.01	1.01	[0.56, 1.82]
Parent’s cigarette use	0.47	1.60	[0.64, 4.03]	0.36	1.43	[0.55, 3.70]
Friends’ cigarette use	0.80***	2.22	[1.67,2.94]	0.82***	2.26	[1.69,3.03]
Sibling’s cigarette use (sib. cig.)	0.73	2.08	[0.98, 4.40]	0.84*	2.31	[1.04,5.17]
Shared friends (shr. fr.)	−0.45	0.64	[0.39, 1.05]	−0.63	0.54	[0.27, 1.06]
Sibling modeling (mod.)	−0.16	0.85	[0.46, 1.59]	0.36	1.44	[0.60, 3.43]
Sib. Cig. × Mod.				−0.68	0.51	[0.17, 1.50]
Sib Cig × Shr. Fr.				0.37	1.45	[0.54, 3.88]
Mod. × Shr. Fr.				0.64*	1.89	[1.04,3.42]
χ2		74.27			79.27
df		13			16

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

^*p < .05;

^**p < .01;

^***p < .001.