Gene-Environment Correlation and Interaction in Peer Effects on Adolescent Alcohol and Tobacco Use

. Author manuscript; available in PMC: 2010 Jul 7.

Published in final edited form as: Behav Genet. 2008 Mar 27;38(4):339–347. doi: 10.1007/s10519-008-9202-7

Parameter	Estimate	95% Interval
A _y	0.302	0.239, 0.379
E _y	0.153	0.123, 0.187
A _x	0.393	0.258, 0.533
E _x	0.327	0.239, 0.436
b ₁	0.222	0.013, 0.431
b ₂	0.292	0.194, 0.391
b ₃	0.677	0.559, 0.881
b _sex−y	−0.077	−0.176, 0.020
b _sex−x	−0.044	−0.205, 0.124
b _age−y	0.050	0.019, 0.083
b _age−x	0.141	0.090, 0.193

Note: Results from full interactive model fit to sub-sample of same-sex twin pairs only