Table 2.
Comparison of sleep characteristics between patients with obstructive sleep apnea syndrome (OSAS) and patients with overlap syndrome (OS).
| OSAS Patients n = 163 |
Overlap Syndrome Patients n = 163 |
p | |
|---|---|---|---|
| Recording time (min) | 378 (356–404) | 383 (336–402) | 0.665 |
| TST (min) | 306 (248.5–335.5) | 309.8 (253.3–349.6) | 0.152 |
| N1 (%) | 18.8 (9–34.5) | 15.6 (7.8–31.9) | 0.308 |
| N2 (%) | 59.8 (45.6–72.4) | 60.6 (45.4–73.3) | 0.646 |
| N3 (%) | 5.6 (0–14.6) | 6.3 (0.03–12.9) | 0.939 |
| REM (%) | 9.6 (3.9–14.5) | 7.6 (2.4–15) | 0.275 |
| AHI (events/h) | 35.2 (16.8–62.3) | 36.8 (16–61) | 0.346 |
| ODI (events/h) | 46.3 (26.5–63.1) | 45.9 (22.5–69.9) | 0.668 |
| Aver SpO2 (%) | 92 (90–93) | 91 (88–93) | 0.008 |
| Min SpO2 (%) | 78 (70–83) | 75 (66.3–82) | 0.100 |
| T < 90% (min) | 12.1 (3.4–35.9) | 22.3 (4.8–55.1) | 0.020 |
| Arousal index | 31.3 (22–45.7) | 27.3 (12–45.2) | 0.110 |
| Sleep efficiency (%) | 80.8 (69.2–86.6) | 81.8 (69.2–89.4) | 0.300 |
| ESS score | 9 (6–14) | 9 (6–14) | 0.988 |
Abbreviations: AHI: apnea hypopnea index; Aver SpO2: average oxyhemoglobin saturation; ESS: Epworth sleepiness scale; Min SpO2: minimum oxyhemoglobin 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; T < 90%: time with oxyhemoglobin saturation <90%.