Table 3.

Summary of Logistic Regression Analysis for Variables Predicting Siblings’ Similarities in Alcohol Use (N = 326)

	Model 1			Model 2			Model 3
	B	OR	95% CI	B	OR	95% CI	B	OR	95% CI
Intercept	1.56***			1.74***			1.67***
Parent Alc Use	−.69*	.50	.28 – .90	−.69*	.50	.29 – .90	−.76*	.47	.26 – .85
OS Gender	−.59*	.56	.35 – .89	−.59*	.55	.35 – .89	−.64**	.53	.33 – .86
YS Gender	−.09	.91	.57 – 1.47	−.07	.93	.58 – 1.51	−.06	.94	.58 – 1.54
OS Intimacy	.19	1.21	.81 – 1.80	.19	1.21	.79 – 1.85	.15	1.16	.75 – 1.79
YS Intimacy	.01	1.01	.68 – 1.50	−.07	.97	.64 – 1.47	−.04	.96	.63 – 1.48
GC	−.19	.83	.52 – 1.32	−.21	.81	.51 – 1.30	.05	1.06	.45 – 2.45
Dum1				−.22	.80	.45 – 1.43	.39	1.47	.63 – 3.42
Dum2				−.33	.72	.37 – 1.40	−.67	.51	.21 – 1.28
Dum1 X GC							−1.12*	.33	.11 – 1.00
Dum2 X GC							.75	2.12	.61 – 7.41
Δχ 2		408.9			407.79			397.63**
df		6			8			10

Note: OR = Odds Ratio; 95% CI = 95% Confidence Interval. Parent Alc Use = Parents’ Alcohol Use (0 = did not use in past year; 1 = used in past year); OS = Older Sibling (0 = female; 1 = male); YS = Younger Sibling (0 = female; 1 = male); GC = Sibling Dyad Gender Composition (0 = same gender; 1 = mixed gender); Dum1 = Cluster Solution Dummy Code 1 (0 = younger sibling admiration; 1 = mutual modeling/shared friends); Dum 2 = Cluster Solution Dummy Code 2 (0 = younger sibling admiration; 1= differentiation).

^*p < .05.

^**p < .01.

^***p < .001.