TABLE 3. Relative Median Frequency and Amplitude Levels Before and After Arousal-Induced Photoplethysmogram Responses.
| Type of arousal |
 |
Frequency | Amplitude | ||
|---|---|---|---|---|---|
| Before | After | Before | After | ||
| Apnea, Des | 2477 | −2.23% | +16.5% | +15.8% | −14.2% |
| Apnea, no Des | 1009 | −1.20% | +16.7% | −7.82% | −31.2% |
| Hypopnea, Des | 8305 | −0.26% | +14.3% | +22.0% | −9.78% |
| Hypopnea, no Des | 11613 | −2.63% | +11.1% | +3.02% | −25.8% |
| Spontaneous | 27359 | +1.48% | +12.7% | +8.20% | −17.9% |
The frequency and amplitude levels are shown as relative differences from stable sleep median. The significance of the differences was assessed with the Wilcoxon signed-rank test, and differences with
have been marked in bold. The levels before and after responses were defined based on the fitting of (2) as detailed in the supplementary Table S.I For other than spontaneous arousals, the arousal type is the type of the arousal-inducing respiratory event. Des, ≥3% blood oxygen desaturation.