Distribution of sleep characteristics of the cohort, overall and by the presence of atrial fibrillation (AF)
| Overall (n=2048) | No AF (n=1948) | AF (n=100) | p Value | ||||||
|---|---|---|---|---|---|---|---|---|---|
| N | Mean | SD | Median | Mean | SD | Mean | SD | ||
| AHI (events/h) | 2048 | 14.8 | 16.7 | 9.1 | 14.6 | 16.5 | 20 | 20.6 | 0.01 |
| CAI (events/h) | 2026 | 0.4 | 1.7 | 0 | 0.4 | 1.8 | 0.5 | 1.3 | 0.02 |
| ODI (events/h) | 2018 | 14.2 | 16.2 | 8.2 | 13.9 | 15.9 | 19.7 | 20.3 | 0.004 |
| % time SpO2 <90% | 2048 | 3.8 | 9 | 0.6 | 3.7 | 8.8 | 6.4 | 12.8 | 0.003 |
| SWS time (min) | 2026 | 36.9 | 34.2 | 29 | 37.6 | 34.4 | 23.9 | 26.5 | <0.001 |
| % SWS time | 2026 | 10 | 9 | 8.1 | 10.2 | 9 | 7.3 | 8 | <0.001 |
| REM time (min) | 2026 | 66.4 | 29.9 | 66 | 66.7 | 30 | 60.5 | 28.7 | 0.05 |
| % REM time | 2026 | 18 | 6.7 | 18.3 | 18 | 17.7 | 17.6 | 6.4 | 0.6 |
| Arousal index (events/h) | 2026 | 22.3 | 12 | 19.8 | 22.3 | 12 | 22.1 | 12.3 | 0.7 |
| Sleep efficiency-PSG (%) | 2018 | 79.6 | 12.7 | 82.2 | 79.9 | 12.6 | 73.4 | 13.3 | <0.001 |
| Sleep efficiency-actigraphy (%) | 1938 | 89.8 | 3.8 | 90.4 | 89.8 | 3.6 | 89.2 | 5.7 | 0.08 |
| Sleep duration-actigraphy (h) | 1938 | 6.5 | 1.4 | 6.6 | 6.5 | 1.3 | 6.4 | 1.6 | 0.8 |
Sleep characteristics between AF versus No AF group were compared using unpaired student's t test.
AHI: apnoea hypopnoea index based on all obstructive and central apnoeas and hypopnoeas with ≥4% desaturation/sleep hour; CAI, central apnoea index; all central apnoeas with 4% desaturation or arousal/sleep hour; ODI, oxygen desaturation index; SpO2, oxygen saturation; SWS, slow wave sleep; REM, rapid eye movement; PSG, polysomnography.