Table 1.
Demographic data and polysomnography parameters
| Severity | |||||
|---|---|---|---|---|---|
| AHI ≦ 5 | 5 < AHI ≦ 15 | 15 < AHI ≦ 30 | AHI > 30 | ||
| No. of subjects; (male) | 10 (10) | 17 (15) | 16 (14) | 29 (27) | |
| Age, years | 42.6 ± 3.7 | 43.8 ± 3.0 | 41.4 ± 2.2 | 43.5 ± 2.0 | p = 0.913 |
| BMI, kg/m2 | 24.2 ± 0.9 | 24.5 ± 1.0 | 26.3 ± 0.8 | 28.6 ± 0.8abc | p = 0.001 |
| AHI, events/hour | 2.0 ± 0.5 | 10.3 ± 0.8a | 20.8 ± 1.0ab | 57.5 ± 3.4abc | p < 0.001 |
| Sleep efficiency, % | 75.0 ± 7.0 | 73.1 ± 3.3 | 71.5 ± 3.1 | 67.4 ± 3.1 | p = 0.510 |
| ODI, events/hour | 1.6 ± 0.6 | 9.6 ± 1.0a | 18.2 ± 1.5ab | 57.7 ± 4.3abc | p < 0.001 |
| Mean SpO2, % | 94.3 ± 1.0 | 94.0 ± 0.5 | 93.5 ± 0.6 | 88.7 ± 0.8abc | p < 0.001 |
| Lowest SpO2, % | 89.0 ± 2.2 | 85.4 ± 0.9 | 79.3 ± 1.5ab | 73.2 ± 1.6abc | p < 0.001 |
| Time with SpO2 < 85%, minutes | 0.6 ± 0.6 | 0.5 ± 0.2 | 2.6 ± 0.7b | 27.5 ± 5.8abc | p < 0.001 |
BMI, body mass index; AHI, apnea-hypopnea index; ODI, 4% oxygen desaturation index; SpO2, oxygen saturation. (Data are presented as mean ± SE; ap < 0.05 vs. AHI ≦ 5, bp < 0.05 vs. 5 < AHI ≦ 15, and cp < 0.05 vs. 15 < AHI ≦ 30)