TABLE 1. Subject Characteristics.
| Characteristics | AHI < 5 | 5 ≤ AHI < 15 | 15 ≤ AHI < 30 | AHI ≥ 30 | All |
|---|---|---|---|---|---|
| Number (Male) | 12 (4) | 13 (9) | 11 (7) | 14 (10) | 50 (30) |
| Age, year | 45.5 ± 16.0 | 55.0 ± 14.1 | 50.1 ± 9.1 | 59.7 ± 16.1 | 53.0 ± 14.9 |
| Body mass index, kg/m2 | 28.5 ± 5.8 | 26.7 ± 4.1 | 28.0 ± 4.8 | 33.6 ± 8.1 | 29.4 ± 6.4 |
| AHI, events per hour | 3.1 ± 1.4 | 8.9 ± 2.7 | 22.3 ± 4.0 | 60.9 ± 34.3 | 25.4 ± 29.5 |
| Obstructive AHI, events per hour | 2.7 ± 1.7 | 7.6 ± 3.7 | 19.1 ± 7.9 | 55.6 ± 38.5 | 22.4 ± 29.7 |
| Central AHI, events per hour | 0.4 ± 0.9 | 2.6 ± 7.1 | 3.1 ± 6.0 | 3.8 ± 10.1 | 2.5 ± 7.0 |
| Total sleep time, hour | 5.4 ± 1.2 | 5.2 ± 1.4 | 5.3 ± 1.3 | 4.8 ± 1.6 | 5.2 ± 1.4 |
| Sleep efficiency, % | 78.2 ± 12.5 | 77.8 ± 15.6 | 76.7 ± 13.5 | 70.0 ± 24.0 | 75.5 ± 17.2 |
| REM sleep percentage | 13.6 ± 5.6 | 16.0 ± 7.2 | 17.8 ± 7.0 | 12.9 ± 8.5 | 15.0 ± 7.3 |
| Arousal index, arousals per hour | 18.1 ± 10.2 | 17.1 ± 7.7 | 24.9 ± 10.5 | 54.9 ± 33.0 | 29.6 ± 24.7 |
| Count of sleep position changes | 76 ± 21 | 77 ± 24 | 89 ± 22 | 110 ± 56 | 89 ± 37 |
| Average magnitude of movement, arbitrary units | 27.8 ± 16.4 | 32.7 ± 22.2 | 37.9 ± 22.1 | 28.1 ± 18.3 | 31.4 ± 19.7 |
| Periodic limb movement index, movements per hour | 23.7 ± 37.1 | 11.4 ± 16.3 | 11.6 ± 18.6 | 24.1 ± 34.6 | 17.9 ± 28.3 |
| Average respiratory rate, breaths per minute | 15.8 ± 3.1 | 15.2 ± 3.1 | 14.7 ± 1.1 | 17.4 ± 3.6 | 15.9 ± 3.0 |
| Variance of respiratory rate, breaths per minute squared | 3.1 ± 2.4 | 3.1 ± 2.4 | 2.4 ± 1.3 | 7.4 ± 9.1 | 4.1 ± 5.4 |
| Average heart rate, beats per minute | 68.4 ± 10.5 | 68.3 ± 8.5 | 63.0 ± 8.2 | 76.1 ± 10.7 | 69.3 ± 10.5 |
| Variance of heart rate, beats per minute squared | 21.6 ± 16.7 | 14.9 ± 8.7 | 12.2 ± 8.9 | 17.3 ± 12.5 | 16.6 ± 12.3 |
Characteristics of subjects collected from overnight polysomnography and sleep technician annotations. Data is presented in mean ± standard deviation. AHI = apnea hypopnea index, REM = rapid eye movement.