Table 3.
Comparison of the polysomnographic data
| Parameter | Males (N = 189) | Females (N = 92) | P value |
|---|---|---|---|
| TST (min) | 374.34 ± 132.58 | 371.22 ± 132.00 | 0.854 |
| S-efficiency (%) | 74.21 ± 17.06 | 73.41 ± 15.50 | 0.705 |
| WASO (min) | 85.75 (44.73, 142.65) | 93.30 (41.50, 148.00) | 0.769 |
| N1 (%TST) | 6.25 (3.00, 13.33) | 5.60 (2.40, 13.30) | 0.324 |
| N2 (%TST) | 59.62 ± 15.33 | 55.67 ± 18.02 | 0.058 |
| N3 (%TST) | 7.60 (2.35, 14.03) | 10.70 (3.90, 17.30) | 0.039* |
| REM (%TST) | 18.30 (11.35, 26.13) | 19.50 (13.20, 27.80) | 0.364 |
| SOL (min) | 6.90 (2.98, 14.73) | 11.80 (4.50, 21.80) | 0.004* |
| REM latency (min) | 67.00 (25.25, 115.13) | 64.50 (23.25, 132.25) | 0.927 |
| AHI | 24.35 (13.95, 45.13) | 20.90 (18.00, 80.00) | 0.081 |
| ODI | 24.85 (11.38, 43.65) | 25.65 (8.78, 38.15) | 0.866 |
| Longest apnoea (sec) | 53.50 (34.00, 91.25) | 40.00 (18.00, 80.00) | 0.002* |
| Longest hypoventilation (sec) | 96.88 ± 24.27 | 95.82 ± 28.02 | 0.749 |
| Min-SpO2 (%) | 93.60 ± 7.55 | 85.10 ± 6.79 | 0.806 |
| ArI | 29.00 (20.85, 39.75) | 23.00 (16.30, 36.60) | 0.014* |
| RERAI | 5.00 (2.50, 10.40) | 3.90 (1.80, 7.60) | 0.019* |
| PLMS index | 12.95 (3.23, 28.38) | 8.70 (2.60, 21.30) | 0.254 |
(*P < 0.05; the data in the table are expressed as x ± s, or M (P25, P75)). Abbreviations: TST, total sleep time; WASO, wake time after sleep onset; REM, rapid eye movement sleep; SOL, sleep onset latency; AHI, apnoea‒hypopnea index; ODI, oxygen desaturation index; Min-SpO2, minimum pulse oxygen saturation; ArI, arousal index; RERAI, respiratory effort-related arousal index; PLMS, periodic limb movement syndrome