. Author manuscript; available in PMC: 2017 Nov 1.

Published in final edited form as: Behav Genet. 2016 Aug 1;46(6):735–741. doi: 10.1007/s10519-016-9801-7

Table 4.

Estimates of proportions of variance and covariance accounted for by additive genetic, shared and unique environmental sources for drug abuse ascertained from medical (DAM) and criminal (DAC) records, in designs including twins, full siblings and half siblings.

	Amc+Ams=Am	Cm	Em	Af	Cf	Ef	rgmf
DAM	0.35+0.24 = 0.59	0.13	0.28	0.52	0.07	0.41	0.82
DAC	0.21+0.45 = 0.66	0.20	0.15	0.59	0.15	0.26	0.39
DAM-DAC covariance	0.62/0.76	1.00	0.40	0.61	1.00	0.38

Amc: gender-common additive genetic contributon in males; Ams: male-specific additive genetic contribution, Am: additive genetic contribution in males, Af: additive genetic contribution in females, Cm: shared environmental contribution in males, Cf: shared environmental contribution in females, Em: unique environmental contribution in males, Ef: unique environmental contribution in females, rgmf: genetic correlation across males and females