Table 4.
PSG and Sleep Disorder Predictors of the Difference Between GGIR Actigraphy TST Without a Sleep Diary and PSG TST (HDCZA Actigraphy-PSG, Hours)
| Univariable | Multivariable | |||
|---|---|---|---|---|
| Characteristic | Beta (95% CI)a | P-value | Beta (95% CI)a | P-value |
| (Intercept) | −0.8 (−0.88, −0.72) | <0.001 | ||
| Actigraphy TST (mean-centered), hours | 0.64 (0.60, 0.69) | <0.001 | 0.56 (0.52, 0.60) | <0.001 |
| PSG SOL, hours | 0.89 (0.66,1.1) | <0.001 | 0.79 (0.68, 0.91) | <0.001 |
| PSG WASO, hours | 0.56 (0.45, 0.66) | <0.001 | 0.81 (0.76, 0.87) | <0.001 |
| AHI, per 10 events/hour | −0.08 (−0.12, −0.03) | 0.001 | — | — |
| Arousal index, events/hour | −0.01 (−0.01, 0.00) | 0.007 | — | — |
| Insomnia symptoms | −0.34 (−0.57, −0.12) | 0.003 | — | — |
| Daytime sleepiness (ESS) | −0.03 (−0.05, −0.01) | 0.005 | — | — |
| PSG 3% Oxygen desaturation index, desaturations/hour | −0.01 (−0.02, 0.00) | <0.001 | — | — |
aCI, Confidence Interval.
Multivariable model: R2/R2 adjusted = 0.78/ 0.78.
Variables were not in the multivariable model due to nonsignificance (AHI, insomnia, p > 0.05) or multicollinearity (sleep efficiency, arousal index, and 3% oxygen desaturation index).