Table 2.
Comparison of sleep characteristics between controls and obstructive sleep apnea syndrome (OSAS) patients.
| Controls | Mild OSAS | Moderate OSAS | Severe OSAS | Controls versus mild OSAS | Controls versus moderate OSAS | Controls versus severe OSAS | Mild versus moderate OSAS | Mild versus severe OSAS | Moderate versus severe OSAS | |
|---|---|---|---|---|---|---|---|---|---|---|
| TST (min) | 294.7 ± 44.6 | 307.4 ± 43.8 | 302.9 ± 51.6 | 282.6 ± 73.6 | 0.224 | 0.505 | 0.097 | 0.699 | 0.009 | 0.047 |
| N1 (%) | 13.5 (10.8–20.6) | 14.1 (7.9–25.2) | 22.1 (15.2–32.2) | 23.4 (13.2–40.6) | 0.467 | 0.234 | 0.528 | 0.910 | 0.721 | 0.549 |
| N2 (%) | 55.1 ± 14.2 | 52.3 ± 17.5 | 52.1 ± 8.4 | 53.2 ± 12.2 | 0.471 | 0.323 | 0.466 | 0.929 | 0.787 | 0.577 |
| N3 (%) | 9.1 (2–17.1) | 6.1 (0–12) | 9.8 (3–16.9) | 7.2 (3.2–17.8) | 0.065 | 0.771 | 0.602 | 0.047 | 0.005 | 0.863 |
| REM (%) | 11 (7.3–17.9) | 10 (6–23.5) | 13 (9.3–17.2) | 9.1 (4.7–14.7) | 0.494 | 0.951 | 0.386 | 0.691 | 0.307 | 0.282 |
| AHI (events/h) | 2 (1–3.5) | 10 (6–13) | 21.3 (18–27) | 61.4 (45–75.7) | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 | <0.001 |
| ODI (events/h) | 25.3 (14–46.7) | 34.8 (10.8–50.7) | 23.8 (12–60.2) | 34.1 (12.7–68.7) | 0.399 | 0.323 | 0.546 | 0.813 | 0.451 | 0.508 |
| Aver. SpO2 (%) | 92 ± 3.7 | 91.5 ± 4.1 | 92.2 ± 2.9 | 92.3 ± 2.7 | 0.547 | 0.863 | 0.713 | 0.444 | 0.200 | 0.862 |
| Min. SpO2 (%) | 76.7 ± 11 | 74.2 ± 15 | 80 ± 11 | 79.9 ± 10.2 | 0.419 | 0.242 | 0.123 | 0.091 | 0.039 | 0.976 |
| Arousal index | 18.1 (13.9–22.5) | 22 (11.7–32.3) | 27.9 (21.2–45.2) | 23.1 (11.9–30.8) | 0.166 | 0.310 | 0.388 | 0.484 | 0.013 | 0.055 |
| Sleep efficiency (%) | 78.5 ± 10.1 | 80 ± 9.4 | 80 ± 10.9 | 72.8 ± 15.8 | 0.514 | 0.572 | 0.019 | 0.998 | 0.002 | 0.009 |
| ESS score | 7.7 ± 5.6 | 8.9 ± 4.7 | 8.5 ± 5.2 | 10.8 ± 5.3 | 0.218 | 0.490 | 0.001 | 0.757 | 0.018 | 0.034 |
AHI: apnea-hypopnea index; Aver. SpO2: average oxyhaemoglobin saturation; ESS: Epworth sleepiness scale; Min. SpO2: minimum oxyhaemoglobin saturation; N1: sleep stage 1; N2: sleep stage 2; N3: sleep stage 3; ODI: oxygen desaturation index; REM: rapid eye movement; TST: total sleep time.