Table 2.
Fit of Biometric Models
| Model | Loglikelihood value (# free parameters) | AIC | BIC | Model comparison | Δχ2 (Δ df) | p |
|---|---|---|---|---|---|---|
| AE for PTSD | −3603.305 (3) | 7213 | 7226 | |||
| Bivariate Models | ||||||
| 1a. Full Moderation | −4860.90 (12) | 9746 | 9799 | |||
| 2a. No Moderation | −4900.443 (8) | 9817 | 9852 | 1a. vs. 2a. | 79.09 (4) | < .001 |
| 3a. Common AE moderated paths to 0 | −4863.059 (10) | 9746 | 9790 | 1a. vs. 3a. | 4.32 (2) | .12 |
| 4a. PTSD-specific moderated A path to 0 | −4866.223 (9) | 9750 | 9790 | 3a vs. 4a. | 6.33 (1) | .01 |
| 5a. PTSD-specific moderated E path to 0 | −4876.387 (9) | 9771 | 9811 | 3a. vs. 5a. | 26.66 (1) | < .001 |
| Univariate Models | ||||||
| 1b. Full Moderation | −4862.619 (13) | 9751 | 9809 | |||
| 2b. No Moderation | −4899.861 (11) | 9822 | 9870 | 1b. vs. 2b. | 74.48 (2) | < .001 |
| 3b. Moderated A path to 0 | −4865.805 (12) | 9756 | 9809 | 1b. vs. 3b. | 6.36 (1) | .01 |
| 4b. Moderated E path to 0 | −4875.682 (12) | 9775 | 9829 | 1b vs. 4b. | 26.13 (1) | < .001 |
Note. The p-value column reflects the statistical significance of the difference in χ2 values across competing models. AIC = Akaike information criterion; BIC = Bayesian information criterion; A = genetic; E = non-shared environment; vs. = versus; PTSD = posttraumatic stress disorder.