TABLE 1. Demographical Information and Sleep Statistics of the Subjects, and Arousal Types.
 |
% of the population | |
|---|---|---|
| Male | 481 | 54.9 |
| Female | 395 | 45.1 |
| Median | Interquartile range | |
| Age (years) | 55.9 | 44.7–65.7 |
| BMI (kg/m2) | 34.4 | 29.4–40.4 |
| TST (h) | 4.2 | 5.1–6.0 |
| WASO (h) | 1.7 | 1.0–2.5 |
| AHI (1/h) | 18.6 | 8.3–39.2 |
| ArI (1/h) | 26.3 | 17.9–41.3 |
| ArRI (1/h) | 11.1 | 4.5–24.4 |
| Stage R (%) | 17.1 | 11.9–22.1 |
| NREM (%) | 82.9 | 77.9–88.1 |
| Stage N1 (%) | 11.0 | 6.8–18.8 |
| Stage N2 (%) | 48.4 | 41.4–56.1 |
| Stage N3 (%) | 18.4 | 9.6–27.0 |
| Type of arousal |
 |
% of studied arousals |
| Apnea, Desaturation | 2287 | 4.3 |
| Apnea, no Desaturation | 935 | 1.8 |
| Hypopnea, Desaturation | 8214 | 15.5 |
| Hypopnea, no Desaturation | 11571 | 21.8 |
| Spontaneous | 29954 | 56.6 |
BMI, body mass index; TST, total sleep time; WASO, wake after sleep onset; AHI, apnea-hypopnea index; ArI, arousal index; ArRI, respiratory arousal index; Stage R, rapid eye movement (REM) sleep; NREM, non-REM sleep; Stage N1, NREM 1 sleep; Stage N2, NREM 2 sleep; Stage N3, NREM 3 sleep; Desaturation, ≥3% blood oxygen desaturation. Sleep stage percentages were calculated from TST. For other than spontaneous arousals, the arousal type is the type of the arousal-inducing respiratory event.