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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Psychol Med. 2008 Jun 26;38(11):1567–1575. doi: 10.1017/S003329170800384X

Fig. 2.

Fig. 2

The proportion of total variance in symptoms of anxiety and depression (SxAnxDep) accounted for by genetic factors through development. The y axis represents the total phenotypic variance so the sum of all the factors equals the total heritability. The first genetic factor, which starts at ages 8–9, is represented in dark grey. An intermediate grey represents the second genetic factor starting at ages 13–14. Light grey represents the third genetic factor starting at ages 16–17 and white represents the fourth genetic factor acting only at ages 19–20.