Table 5.
Multivariate model fit indices for respiratory sinus arrhythmia (RSA), heart rate (HR1 at rest 1, HR2 at rest 2) skin conductance level (SCL) and non-specific skin conductance response (NS-SCR)
| Model # | Overall fit
|
Compared to model # | Model difference test
|
|||||
|---|---|---|---|---|---|---|---|---|
| −2LL | DF | AIC | BIC | Δχ2 | Δdf | p | ||
| 1 Fully saturated model | −1820.515 | 4900 | −11620.515 | −16537.402 | ||||
| 2 Cholesky | −1577.138 | 5125 | −11827.138 | −17133.286 | 1 | 243.38 | 225 | .191 |
| 3 Two-factor common pathway | −1525.844 | 5157 | −11839.844 | −17209.694 | 1 | 294.67 | 257 | .053 |
| 4 One-factor common pathway | −1082.213 | 5171 | −11424.213 | −17032.528 | 1 | 738.30 | 271 | <.001 |
| 3a Equate parameters in males and females (loadings + common ACE + specific ACE) | −1471.950 | 5186 | −11843.950 | −17275.234 | 3 | 53.89 | 29 | .003 |
| 3b Factor structure: sympathetic and parasympathetic, male and female parameters allowed to differ | −1508.669 | 5163 | −11834.669 | −17220.242 | 3 | 17.18 | 6 | .009 |
| 3c Sympathetic factor structure in both sexes, i.e., drop RSA from factor 1 | −1523.449 | 5159 | −11841.449 | −17214.875 | 3 | 2.40 | 2 | .302 |
| 3d Sympathetic factor in both sexes and parasympathetic factor in males (i.e., drop SCL and NS-SCR from Factor 2) | −1508.814 | 5161 | −11830.814 | −17213.936 | 3 | 17.03 | 4 | <.001 |
| 3e Sympathetic factor in both sexes and parasympathetic factor in females (i.e., drop SCL and NS-SCR from Factor 2) | −1522.439 | 5161 | −11844.439 | −17220.748 | 3 | 3.41 | 4 | .493 |
| 3f Drop common A | −1514.051 | 5165 | −11844.051 | −17229.311 | 3e | 8.39 | 4 | .078 |
| 3g Drop common C | −1512.732 | 5165 | −11842.732 | −17228.652 | 3e | 9.71 | 4 | .046 |
| 3h Drop common A and common C on Factor 1 | −1409.025 | 5165 | −11739.025 | −17176.798 | 3e | 113.42 | 4 | <.001 |
| 3i Drop common A and common C on Factor 2 | −1434.938 | 5165 | −11764.938 | −17189.755 | 3e | 87.50 | 4 | <.001 |
| 3j Drop specific A (HR1, HR2, NS-SCR) and specific C (RSA, HR1, HR2, NS-SCR) | −1513.938 | 5175 | −11863.938 | −17261.147 | 3e | 8.50 | 14 | .862 |
−2LL −2(log-likelihood), AIC Akaike’s Information Criterion, BIC Bayesian Information Criterion, Δχ2 difference in log-likelihoods between nested models, Δdf change in degrees of freedom, A additive genetic influences, C shared environmental influences, E non-shared environmental influences