Table 1.
Demographic and polysomnographic information of the study population
| Whole population (n = 894) | Training set (n = 715) | Validation set (n = 90) | Test set (n = 89) | |
|---|---|---|---|---|
| Median (interquartile range) | ||||
| Age (years) | 55.9 (44.7–65.8) | 55.8 (44.7–66.0) | 56.6 (42.9–66.4) | 56.1 (45.3–63.3) |
| ArI (1/h) | 20.7 (13.9–31.4) | 21.1 (14.1–32.5) | 18.9 (13.2–26.6) | 20.5 (13.6–29.5) |
| AHI (1/h) | 15.8 (7.0–32.6) | 16.0 (7.4–33.5) | 12.3 (5.7–30.2) | 16.8 (6.5–33.2) |
| BMI (kg/m2) | 34.4 (29.4–40.4) | 34.2 (29.3–40.1) | 35.9 (28.6–41.5) | 34.8 (31.1–41.2) |
| N1 (%) | 10.9 (6.7–18.8) | 11.1 (6.9–19.3) | 10.8 (6.0–19.1) | 9.7 (5.5–16.2) |
| N2 (%) | 48.3 (41.2–56.2) | 48.2 (41.6–56.5) | 50.3 (40.3–55.2) | 48.8 (38.5–55.6) |
| N3 (%) | 18.3 (9.6–26.8) | 18.0 (9.4–26.9) | 17.7 (9.4–26.0) | 20.4 (11.4–27.8) |
| NREM (%) | 82.9 (77.8–88.1) | 83.0 (77.8–88.1) | 82.4 (78.5–88.8) | 82.4 (77.1–86.4) |
| REM (%) | 17.1 (11.8–22.0) | 16.9 (11.8–22.2) | 17.5 (11.0–21.4) | 17.6 (12.5–22.8) |
| SE (%) | 70.7 (58.1–81.9) | 70.7 (57.9–81.7) | 69.9 (55.2–83.6) | 71.9 (60.1–80.7) |
| SL (min) | 17.5 (9.0–34.5) | 17.5 (9.5–35.1) | 19.0 (7.0–29.8) | 15.0 (9.0–33.5) |
| TRT (min) | 442.3 (409.5–474.0) | 442.0 (410.3–474.5) | 449.0 (412.4–474.6) | 438.0 (403.1–464.5) |
| TST (min) | 308.8 (253.5–359.5) | 309.5 (253.0–359.5) | 304.0 (249.5–368.6) | 304.0 (259.3–347.8) |
| WASO (min) | 102.5 (61.0–149.5) | 102.8 (61.0–152.0) | 96.0 (60.6–144.4) | 100.0 (65.4–135.8) |
| n (% of the population) | ||||
| No OSA | 154 (17.2) | 117 (16.4) | 20 (22.2) | 18 (20.2) |
| Mild OSA | 278 (31.1) | 224 (31.3) | 29 (32.2) | 24 (27.0) |
| Moderate OSA | 209 (23.4) | 168 (23.5) | 17 (18.9) | 24 (27.0) |
| Severe OSA | 253 (28.3) | 206 (28.8) | 23 (25.6) | 24 (27.0) |
| Female | 398 (44.5) | 320 (44.8) | 39 (43.3) | 39 (43.8) |
| Male | 496 (55.5) | 395 (55.2) | 50 (55.6) | 51 (57.3) |
ArI, arousal index; AHI, apnea-hypopnea index; BMI, body mass index; SE, sleep efficiency; SL, sleep latency; TRT, total recording time; TST, total sleep time; WASO, wake after sleep onset. No obstructive sleep apnea (OSA): AHI < 5, mild OSA: 5 ≤ AHI < 15, moderate OSA: 15 ≤ AHI < 30, severe OSA: AHI ≥ 30.