. Author manuscript; available in PMC: 2013 May 2.

Published in final edited form as: J Clin Child Adolesc Psychol. 2009 Mar;38(2):232–244. doi: 10.1080/15374410802698404

Table 3.

Regression analyses predicting adolescent alcohol use behaviors with stepwise entry of adolescent- and parent-derived profile memberships

		Age 14 Alcohol Use			Age 14 Intoxication			Age 17½ Alcohol Use			Age 17½ Intoxication
Step	Predictors	β	ΔR²	ΔF	β	ΔR²	ΔF	β	ΔR²	ΔF	β	ΔR²	ΔF
1	Demographics		.003	4.04^**		.010	12.98^***		.006	6.93^***		.007	7.59^***
	Sex	.046			.094			− .033			− .050
	Zygosity	.027			.039			.039			.034
	Sibling type	.023			.014			.034			.027
2a	APs		.029	23.98^***		.028	22.85^***		.010	7.11^***		.018	12.42^***
	Dummy 1	− .177			− .169			− .085			− .047
	Dummy 2	− .169			− .150			− .026			.058
	Dummy 3	− .093			− .106			.000			.020
	Dummy 4	− .348			− .333			− .129			− .073
	Dummy 5	− .071			− .078			− .019			.030
3a	PPs		.003	5.72^**		.007	15.18^***		.002	2.97		.003	5.11^**
	Dummy 1	− .060			− .143			− .033			− .075
	Dummy 2	− .006			− .065			.011			− .022
	Total		.035			.045			.018			.027

		Age 14 Alcohol Use			Age 14 Intoxication			Age 17½ Alcohol Use			Age 17½ Intoxication
Step	Predictors	β	ΔR²	ΔF	β	ΔR²	ΔF	β	ΔR²	ΔF	β	ΔR²	ΔF

1	Demographics		.003	4.04^**		.010	12.98^***		.006	6.93^***		.007	7.59^***
	Sex	.046			.094			− .033			− .050
	Zygosity	.027			.039			.039			.034
	Sibling type	.023			.014			.034			.027
2b	PPs		.009	18.98^***		.016	33.16^***		.004	6.62^***		.007	11.48^***
	Dummy 1	− .131			− .205			− .064			− .113
	Dummy 2	− .040			− .094			− .002			− .036
3b	APs		.022	18.57^***		.019	15.57^***		.008	5.64^***		.014	9.84^***
	Dummy 1	− .164			− .144			− .076			− .033
	Dummy 2	− .152			− .118			− .016			.075
	Dummy 3	− .084			− .090			.006			.030
	Dummy 4	− .317			− .275			− .107			− .039
	Dummy 5	− .065			− .066			− .015			.036
	Total		.035			.045			.018			.027

Note: APs = adolescent-derived profile membership; PPs = parent-derived profile membership. The significance of standardized coefficients for dummy- coded profile membership is not presented, as the interpretation of individual dummy-codes is meaningless. Demographic variables are coded 1 (boy, monozyotic, and same sex) and 2 (girl, dizygotic, and opposite sex).

^**

p ≤ .01.

^***

p ≤ .001.