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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Alcohol Clin Exp Res. 2018 Sep 4;42(11):2214–2223. doi: 10.1111/acer.13868

Table 5.

Observed Correlations (95% Confidence Interval) from Full, Initial, and Final Best Fit Twin Models for Alcohol Involvement and Eating Disorder Symptoms in Adolescent Girls

Drive for Thinness Body Dissatisfaction
ra rc re ra rc re
Drink in Last Month
ACE .17
(−.41; .75)		 .72
(−1; 1)		 .05
(−.21; .32)		 .30
(−.10; .71)		 1.00
(−1; 1)		 .10
(−.15; .34)
AE .31
(.16; .46) 		-- .03
(−.22; .28) 		.33
(.18; .47) 		-- .10
(−.15; .33)
Ever been Intoxicated
ACE .32
(−.23; .91)		 .51
(−1; 1)		 .32
(−.51; .67)		 -- -- --
ACE-no unique
common
environment 		.27
(−.10; .82) 		1.00a
(1; 1) 		.35
(−.50; .99) 		-- -- --
Frequency of Intoxication
ACE .50
(−.01; 1)		 −.05
(−1; 1)		 .10
(−.18; .38)		 .41
(.03; .82)		 .99
(−1; 1)		 −.06
(−.32; .21)
AE .32
(.18; .46) 		-- .12
(−.15; .38) 		.34
(.18; .48) 		-- −.04
(−.05; .30)

Note. Final best-fit model shown in bold. a2 = heritability. c2 = common environmental estimate. e2 = individual-specific environmental estimate. ra = genetic correlation. rc = common environmental correlation. re = individual-specific environmental correlation.

a

= the confidence interval for the correlation in this bivariate association in the best-fit model is observed at +1.00; +1.00 because there are no common environmental effects specific to drive for thinness that are not shared with having ever been intoxicated.