Table VII.

Standardized Estimates (and 95% CIs) for A, C, and E Influences on Drinking Initiation, Frequency of Alcohol Use, and Problem Drinking for the Full Model in FinnTwin16-Age 25

Variable	A	C	E
	Females
Alcohol initiation	0.44 (0.31–0.60)	0.47 (0.32–0.60)	0.09 (0.06–0.11)
Frequency of use	0.19 (0.01–0.42)	0.31 (0.11–0.47)	0.50 (0.43–0.58)
Problem drinking	0.47 (0.25–0.65)	0.15 (0.00–0.34)	0.38 (0.32–0.45)
	Males
Alcohol initiation	0.22 (0.06–0.39)	0.61 (0.45–0.74)	0.17 (0.13–0.23)
Frequency of use	0.48 (0.29–0.60)	0.08 (0.01–0.23)	0.44 (0.36–0.53)
Problem drinking	0.55 (0.32–0.69)	0.08 (0.00–0.28)	0.36 (0.29–0.44)

A = additive genetic influences; C = common environmental influences; E = unique environmental influences.