Table 4.
Summary of the model fitting results of the longitudinal genetic analyses
| −2 LL | #par | df | χ2 | ∆df | P | BIC | |
|---|---|---|---|---|---|---|---|
| Saturated model | |||||||
| 1. Fully saturated | 1961.155 | 120 | 13,834 | −58715.507 | |||
| 2. rDZ = rSib (versus 1) | 1980.646 | 100 | 13,854 | 19.491 | 20 | .490 | −58792.065 |
| 3. No sex differences for twin/sibling correlations (versus 1) | 2005.494 | 81 | 13,873 | 44.339 | 39 | .257 | −58861.629 |
| 4. Covariate standardized age dropped (versus 1) | 2004.964 | 114 | 13,840 | 43.809 | 6 | <.001 | −58719.494 |
| 5. Covariate squared standardized age dropped (versus 1) | 1983.825 | 114 | 13,840 | 22.670 | 6 | .001 | −58730.063 |
| ADE model (models include restrictions from models 2–5) | |||||||
| 1. ADE-model | 2211.950 | 29 | 13,929 | −59000.051 | |||
| 2. AE-model (versus 6) | 2222.021 | 23 | 13,935 | 10.071 | 6 | .122 | −59020.906 |
| 3. AE-model—A3 dropped (versus 7) | 2228.579 | 22 | 13,936 | 6.558 | 1 | .010 | −59021.943 |
| 4. AE-model—A3 and a22 dropped (versus 8) | 2239.785 | 21 | 13,937 | 11.206 | 1 | .001 | −59020.655 |
| 5. AE-model—A3 and a32 dropped (versus 8) | 2237.624 | 21 | 13,937 | 9.045 | 1 | .003 | −59021.735 |
| 6. AE-model—A3, e21, e31 and e32 dropped (versus 8) | 2251.165 | 19 | 13,939 | 22.586 | 3 | <.001 | −59023.595 |
| 7. AE-model—A3, e21, e31 and e32 dropped + proportion variance explained by A equal for all age groups (versus 11) | 2263.957 | 15 | 13,943 | 12.792 | 4 | .012 | −59034.460 |