Table 4.
Sequential Multivariate Analysis of Body Composition by Quartiles of SWS
| Outcomes | N | Quartile of slow wave sleep (SWS as a % of total sleep time) |
*P-value for trend | |||
|---|---|---|---|---|---|---|
| Quartile 1 0 to ≤ 3.8% | Quartile 2 > 3.8 to ≤ 9.9% | Quartile 3 > 9.9 to ≤ 16.7% | Quartile 4 > 16.7% | |||
| Model 1 | ||||||
| BMI (kg/m2) | 2743 | 27.5 | 27.1 | 27.2 | 26.7 | 0.0001 |
| Weight (kg) | 2743 | 83.5 | 82.1 | 82.3 | 80.4 | < 0.0001 |
| Waist circumference (cm) | 2739 | 100.5 | 99.3 | 99.5 | 98.6 | 0.003 |
| Model 2 | ||||||
| BMI (kg/m2) | 2743 | 27.5 | 27.1 | 27.2 | 26.7 | 0.0009 |
| Weight (kg) | 2743 | 83.3 | 82.1 | 82.4 | 80.5 | 0.0001 |
| Waist circumference (cm) | 2739 | 100.3 | 99.3 | 99.6 | 98.8 | 0.02 |
| Model 3 | ||||||
| BMI (kg/m2) | 2743 | 27.4 | 27.1 | 27.3 | 26.8 | 0.0095 |
| Weight (kg) | 2743 | 83.0 | 82.2 | 82.5 | 80.6 | 0.001 |
| Waist circumference (cm) | 2739 | 100.0 | 99.3 | 99.7 | 98.9 | 0.089 |
Model 1: adjusted for age, race/ethnicity, PASE, clinic
Model 2: adjusted for age, race/ethnicity, PASE, clinic, TST and sleep efficiency
Model 3: adjusted for age, race/ethnicity, PASE, clinic, TST, sleep efficiency and SDB
Results unchanged when TST used as categorical (rather than continuous) variable (data not shown)
*P-value for linear regression (assessing linear trend across quartiles of SWS)