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. Author manuscript; available in PMC: 2012 Sep 1.

Published in final edited form as: Psychol Med. 2011 Jan 20;41(9):1907–1916. doi: 10.1017/S003329171000259X

Fig. 2 — Proportion of total variance in substance consumption common factors accounted for by (a) genetic and (b) shared environmental effects at ages 13–14 (, Factor 1), 16–17 (, Factor 2) and 19–20 (■, Factor 3). The y axis represents the total phenotypic variance so the sum of all the factors equals total heritability.

Inline graphic — Proportion of total variance in substance consumption common factors accounted for by (a) genetic and (b) shared environmental effects at ages 13–14 (, Factor 1), 16–17 (, Factor 2) and 19–20 (■, Factor 3). The y axis represents the total phenotypic variance so the sum of all the factors equals total heritability.