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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Addiction. 2010 Mar;105(3):417–430. doi: 10.1111/j.1360-0443.2009.02831.x

Figure 2.

Figure 2

Figure 2

Heritability estimates (i.e. proportion of variance accounted for by genetic influences (A)) and 95% confidence intervals for the studies used in the meta-analysis of problematic cannabis use for males (2a) and females (2b). The bottom line shows the weighted A estimate and 95% confidence intervals estimated in the present meta-analysis. Dotted lines show confidence intervals estimated by a logarithmic curve regression on the sample sizes.