. Author manuscript; available in PMC: 2016 Dec 1.

Published in final edited form as: Addiction. 2015 Aug 22;110(12):1922–1931. doi: 10.1111/add.13070

Table 5.

GFA Approach: Genetic variance in each DSM-IV symptom explained by common genetic factor

	Factor Loadings	% Total Genetic Variance Explained
Tolerance	0.846	0.716
Withdrawal	0.816	0.666
Using longer than intended	0.838	0.702
Unsuccessful attempts to cut down	0.998	0.996
Great time spent using/recovering	0.692	0.479
Social/Occupation activities foregone	0.829	0.687
Continued use despite problems	0.824	0.679

Table shows the loadings and communality estimates based on the first genetic factor identified using the genetic variance/covariance matrix.