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. Author manuscript; available in PMC: 2021 Feb 1.
Published in final edited form as: J Psychiatr Res. 2019 Nov 8;121:39–46. doi: 10.1016/j.jpsychires.2019.11.001

Figure 1. Path Diagram for the Full Moderation Model and Extended Moderation Model for One Twin Only.

Figure 1.

Abbreviations include: Pub = puberty; A = additive genetic effects; C = shared environmental effects; E = non-shared environmental effects; M1 and M2 =moderator for twin 1 and twin 2, respectively; βM = phenotypic regression coefficient; a, c, and e = paths or intercepts; βX, βY, βZ = linear moderators; βX2, βY2, βZ2 = quadratic moderators. The model is depicted for only one twin, but parameters are fit separately for MZ and DZ twins.