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. Author manuscript; available in PMC: 2015 Aug 8.

Published in final edited form as: J Fam Soc Work. 2014 Jul 23;17(4):324–343. doi: 10.1080/10522158.2014.924457

Table 4. Hierarchical Regressions Predicting Younger Siblings' ATOD Use.

	Beer (n=99)		Hard Alcohol (n=99)		Maximum Alcohol Use (n= 99)		Tobacco (n=99)		Marijuana (n=98)

Variable	ΔR²	β	ΔR²	β	ΔR²	β	ΔR²	β	ΔR²	β
Step 1	.04^*		.10^**		.08^**		.09^**		.05^*
Older Sibling's Developmentally Proximal Use		.23^*		.33^**		.29^**		.31^**		.25^*
Step 2	.07^**		-.004^*		.06^**		.04^**		.01^*
Older Sibling's Developmentally Proximal Use		.21^*		.30^**		.24^*		.28^**		.23^*
Sibling Gender		-.23^*		-.001		-.17^†		-.21^*		-.08
Negative Sibling Interaction		-.06		-.02		-.04		.05		.10
Parent Drug Use		.21^*		.16		.24^*		.15		.14
Step 3	.01^**		-.005^*		.00^**		-.01^**		-.008^†
Older Sibling's Developmentally Proximal Use		.22^*		.31^**		.25^*		.26^*		.25^*
Sibling Gender		-.22^*		.01		-.16		-.21^*		-.08
Negative Sibling Interaction		-.03		-.003		-.01		.04		.11
Parent Drug Use		.26^*		.18^†		.28^**		.13		.16
Deviant Peer Association		-.14		-.06		-.10		.05		-.06
Total Adjusted R²	.12^**		.08^*		.14^**		.12^**		.06^†

Note:

^**

p<.01.

^*

p<.05.

^†

p<.10