Table 3.
PSG and Sleep Disorder Predictors of the Difference Between GGIR Actigraphy TST With a Sleep Diary and PSG TST (Actigraphy- PSG, Hours)
| Univariable | Multivariable | |||
|---|---|---|---|---|
| Characteristic | Beta (95% CI)a | P-value | Beta (95% CI)a | P-value |
| (Intercept) | −0.58 (−0.65, −0.50) | <0.001 | ||
| Actigraphy TST (mean centered), hours | 0.37 (0.31, 0.44) | <0.001 | 0.56 (0.52, 0.60) | <0.001 |
| PSG SOL, hours | 1.1 (0.91, 1.2) | <0.001 | 0.77 (0.67, 0.87) | <0.001 |
| PSG WASO, hours | 0.71 (0.64, 0.78) | <0.001 | 0.79 (0.74, 0.84) | <0.001 |
| AHI, per 10 events/hour | −0.03 (−0.06, 0.01) | 0.14 | −0.03 (−0.05, −0.01) | 0.008 |
| Arousal index, events/hour | 0 (−0.01, 0.00) | 0.2 | — | — |
| Insomnia symptoms | −0.16 (−0.33, 0.01) | 0.064 | — | — |
| Daytime sleepiness (ESS) | −0.02 (−0.04, 0.00) | 0.011 | — | — |
| PSG 3% Oxygen desaturation index, desaturations/hour | −0.01 (−0.01, 0.00) | 0.023 | — | — |
aCI, Confidence Interval.
Multivariable model: R2/R2 adjusted = 0.70/ 0.70.
Variables were not in the multivariable model due to nonsignificance (Insomnia and ESS, p > 0.05) or multicollinearity (sleep efficiency, arousal index, and 3% oxygen desaturation index).