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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: Psychol Med. 2009 Oct 12;40(7):1203–1213. doi: 10.1017/S003329170999122X

Table 2.

Summary of fit information for the full ACEM model as well as ACE, AE, and CE submodels

Model −2LL df Δχ2 Δdf p AIC A2 (CI) C2 (CI) E2 (CI) M2 (CI)
Child similarity factor
Full ACEM 13270.780 8485 – – – −3699.22 0.62 (0.18–0.76) 0.00 (0.00–0.35) 0.38 (0.23–0.62) 0.00 (0.00–0.001)
ACE 13270.777 8486 0.003 1 >0.05 −3701.223 – – – –
Teen similarity factor
Full ACEM 13265.808 8485 – – – −3704.192 0.63 (0.26–0.74) 0.00 (0.00–0.00) 0.37 (0.24–0.56) 0.02 (0.00–0.11)
ACE 13267.540 8486 1.73 1 >0.05 −3704.460 – – – –

−2LL, −2 log-likelihood; AIC, Akaike’s Information Criterion; CI, 95% confidence intervals; A, additive genetic influence on the latent trait; C, common environmental influence on the latent trait; E, unique environmental influence on the latent trait.