Table 3.
Multilevel model of HF-HRV (logged values) by PTSD status and sleep type (NREM vs. REM)
| Parameter | Coeff (SE) | p |
|---|---|---|
| Fixed effects | ||
| Within-person predictors | ||
| Intercept | 8.26 (0.55) | <.001 |
| Sleep type (NREM vs. REM) | 0.34 (0.06) | <.001 |
| Between-person predictors | ||
| Age | −0.06 (0.02) | <.001 |
| Gender | 0.28 (0.42) | .51 |
| AHI | 0.02 (0.04) | .68 |
| BDI Score | 0.01 (0.02) | .63 |
| PTSD status | −0.40 (0.28) | .16 |
| Cross-level interaction | ||
| PTSD status × sleep type | −0.17 (0.09) | .074 |
| Random effects | ||
| Interindividual differences | 0.88 (0.18) | <.001 |
| Variability between sleep cycles | 0.04 (0.02) | .020 |
| Variability within sleep cycles | 0.22 (0.02) | <.001 |