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. Author manuscript; available in PMC: 2013 Dec 12.
Published in final edited form as: J Child Psychol Psychiatry. 2011 Nov 28;53(6):10.1111/j.1469-7610.2011.02501.x. doi: 10.1111/j.1469-7610.2011.02501.x

Figure 1. Constrained correlated factors bivariate model for ADHD and VLF activity1.

Figure 1

1 Circles represent latent additive genetic (A), shared environmental (C) and non-shared environmental (E) factors. a1, a2, e1, e2, c2 represent genetic and environmental path estimates. rg and re represent genetic and environmental correlations between ADHD and VLF activity, Parameters for ADHD (heritability and unique environmental estimates) are fixed values according to meta-analysis (Faraone, et al., 2005).