Table 4.
Multilevel Models of Maternal Sleep Quality Across Gestation & Hippocampal Volume.
| Model 1 – Right Hippocampus | |||
|---|---|---|---|
| HippR | HippR & Covariates | ||
| Fixed Effects | Intercept Centered at 8 Gestational Weeks’ (b0) | 7.01 | 7.02 |
| HippR (b01) | 0.01 * | 0.01 * | |
| ICV (b02) | – | -0.00001 | |
| Postconceptional Age (b03) | – | 0.28 * | |
| BWP (b04) | – | -0.0001 | |
| Sex (b05) | – | -0.45 | |
| Linear Slope (b1) | -0.13⸸ | -0.12⸸ | |
| HippR (b11) | -0.001 * | -0.001 * | |
| Quadratic Growth (b2) | 0.006 * * | 0.006 * * | |
| HippR (b21) | 0.00003 * * | 0.00003 * * | |
| Random Effectsa | Error (σ2e) | 2.21 | 2.21 |
| Intercept (σ2b0) | 13.68 * ** | 13.22 * ** | |
| Slope (σ2b1) | 0.01 * ** | 0.01 * ** | |
| Model 2 – Left Hippocampus | |||
| HippL | HippL & Covariates | ||
| Fixed Effects | Intercept Centered at 8 Gestational Weeks’ (b0) | 6.97 | 6.99 |
| HippL (b01) | 0.011 * | 0.01 * | |
| ICV(b02) | – | -0.00001 | |
| Postconceptional Age (b03) | – | 0.25 | |
| BWP (b04) | – | 0.003 | |
| Sex (b05) | – | -0.49 | |
| Linear Slope (b1) | -0.12⸸ | -0.13⸸ | |
| HippL (b11) | -0.001 * | -0.001 * | |
| Quadratic Growth (b2) | 0.005 * * | 0.005 * * | |
| HippL (b21) | 0.00003 * | 0.00003 * | |
| Random Effectsa | Error (σ2e) | 2.23 | 2.24 |
| Intercept (σ2b0) | 13.09 * ** | 12.84 * ** | |
| Slope (σ2b1) | 0.01 * ** | 0.01 * ** | |
Note: ⸸ p < .08, *p < .05, * *< .01, * **p < .001. HippR = Right hippocampus, HippL= Left hippocampus, ICV = Intracranial volume, BWP = Birth weight percentile. a Intercept and linear slope were tested as random parameters, whereas quadratic growth was tested as a fixed parameter.