Table 2.
Model fitting results for I-CIRS and age-moderated bivariate biometric models of depressive symptoms
| Model | Men | Women | |||||||
|---|---|---|---|---|---|---|---|---|---|
| −2LL | df | Comp | Δ−2LL (Δdf) | −2LL | df | Comp | Δ−2LL (Δdf) | ||
| 1. | Full ACE | 108024 | 14850 | - | - | 126727 | 17240 | - | - |
| 2. | AE | 108032 | 14861 | 1 | 8.14 (11) | 126742 | 17251 | 1 | 15.24 (11) |
| 3. | Drop all CIRS moderation | 108317 | 14865 | 2 | 285.03 (4)** | 126904 | 17255 | 2 | 161.91 (4)** |
| 4. | Drop age 40–75 covariance moderation | 108034 | 14863 | 2 | 2.29 (2) | 126744 | 17253 | 2 | 2.23 (2) |
| 5. | Drop age 75–90 covariance moderation | 108036 | 14865 | 4 | 1.19 (2) | 126744 | 17255 | 4 | 0.02 (2) |
| 6. | Drop age 40–75 unique depression moderation | 108072 | 14867 | 5 | 35.86 (2)** | 126759 | 17257 | 5 | 14.11 (2)** |
| 7. | Drop age 75–90 unique depression moderation | 108056 | 14867 | 5 | 20.17 (2)** | 126754 | 17257 | 5 | 9.02 (2)** |
Notes: More complete model-fitting results in Tables S8 and S9. −2LL = negative log likelihood multiplied by 2; df= degrees of freedom; Comp= model to which compared, Δ−2LL (Δdf) = the difference in log likelihood by difference in degrees of freedom between the model being fit and its comparison model; A = additive genetic variance; C = shared environmental variance; E = non-shared environmental variance; ACE = full model estimating additive genetic, shared environmental, and nonshared environmental variance components; AE= constrained model estimating only additive genetic and nonshared environmental variance components;
= significant deterioration in fit compared to comparison model. Best-fitting model is shown in bold.