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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: J Adolesc Health. 2012 Apr 10;51(5):491–496. doi: 10.1016/j.jadohealth.2012.02.013

Figure 1.

Figure 1

Graphical depiction of full correlated factors bivariate model for age at menarche and disordered eating. The variance in liability to age at menarche is parsed into additive genetic (Am), shared environmental (Cm), and unique environmental (Em) factors. The variance in liability to the Eating Disorder Risk Composite (EDRC) is also parsed into additive genetic (Ad), shared environmental (Cd), and unique environmental (Ed) factors. Paths which are squared, to estimate the proportion of variance accounted for by genetic and environmental factors, are represented by lowercase letters (a2, c2, e2). ra indicates the correlation between the genetic effects responsible for age at menarche and the genetic effects responsible for disordered eating. rc indicates the correlation between the shared environmental effects responsible for age at menarche and the shared environmental effects responsible for disordered eating. re indicates the correlation between the unique environmental effects responsible for age at menarche and the unique environmental effects responsible for disordered eating.