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. Author manuscript; available in PMC: 2017 Apr 1.
Published in final edited form as: Neuroimage. 2016 Jan 29;129:356–366. doi: 10.1016/j.neuroimage.2016.01.049

Table 1.

Trivariate model fitting results for GCA, relative SA, and relative CT.

Model −2ll LRT df Δdf p-value
1. ACE-ACE-ACE Cholesky 4074.984 1524
2. ACE-AE-AE 4075.247 0.263 1529 5 0.998
3. ACE-AE-AE, SA-GCA rp = CT-GCA rp 4087.564 12.317 1530 1 0.001
4. ACE-AE-AE, SA-GCA rg = CT-GCA rg 4082.551 7.304 1530 1 0.007
5. ACE-AE-AE, SA-GCA re = CT-GCA re 4077.435 2.188 1530 1 0.139

Note. Model 1 is the comparison model for Model 2; Model 2 is the comparison model for Models 3–5. A = additive genetic variance; C = common environmental variance; E = unique environmental variance; rp = phenotypic correlation; rg = genetic correlation; re = environmental correlation; GCA = general cognitive ability; SA = cortical surface area; CT = cortical thickness; −2ll = −2 log likelihood; LRT = likelihood-ratio χ 2 -test; df = degrees of freedom; Δdf = change in degrees of freedom.