. Author manuscript; available in PMC: 2014 Jun 1.

Published in final edited form as: Alcohol Clin Exp Res. 2013 Jan 8;37(6):905–913. doi: 10.1111/acer.12058

Table 3.

Cross-Twin and Cross-Twin, Cross-Trait Correlations by Zygosity and Sex, by Zygosity Subgroups

	MZ twins		Same-sex DZ twins		OSDZ twins
	Women	Men	Women	Men	Overall
Cross-twin correlations
Mastery	0.35^***	0.34^***	0.12^*	0.13^***	0.15^***
Alcohol dependence	0.66^***	0.53^***	0.10	0.33^***	0.26^***
Cross-twin, cross-trait correlations
Mastery T1— Alcohol dependence T2	0.04	−0.10	0.12	−0.14^*	−0.06
Mastery T2— Alcohol dependence T1	0.01	−0.15^*	0.03	−0.09	−0.13^**

MZ, monozygotic twins; DZ, same-sex dizygotic twins; OSDZ, oppositesex dizygotic twins. Coefficients for mastery are polychoric correlations. Coefficients for alcohol dependence are tetrachoric correlations, which assume an underlying latent continuous distribution.

p < 0.05

^**

p < 0.01

^***

p < 0.001.