Table 1.
Characteristics of the subjects
| Controls (N = 46) | OSAS (N = 42) | P value | |
|---|---|---|---|
| Age, years | 43.46 (9.70) | 45.02 (9.80) | 0.453 |
| Gender, male, n (%) | 33 (71.74) | 31 (73.81) | 0.862 |
| BMI, kg/m2 | 26.10 (2.09) | 26.96 (2.57) | 0.126 |
| Total sleep time, min | 403.41 (52.15) | 399.33 (41.58) | 0.696 |
| Sleep efficiency, % | 84.84 (7.20) | 84.51 (10.13) | 0.864 |
| AHI, events/h | 2.22 (1.35) | 33.96 (21.56) | <0.001 |
| ArI, events/h | 8.70 (4.25) | 33.03 (17.02) | <0.001 |
| ODI, events/h | 2.14 (1.21) | 28.07 (15.17) | <0.001 |
| Mean SaO2, % | 95.65 (1.18) | 90.64 (2.69) | <0.001 |
| Lowest SaO2, % | 91.30 (1.66) | 80.24 (6.38) | <0.001 |
| Sleep stages 1 and 2, % | 56.26 (10.24) | 62.41 (15.76) | 0.005 |
| Sleep stages 3, % | 25.73 (10.32) | 25.50 (17.99) | 0.197 |
| REM, % | 17.99 (5.67) | 12.09 (6.83) | <0.001 |
Statistical comparisons were tested using two‐tailed independent‐sample t‐tests, Mann–Whitney U test, or chi‐squared test as appropriate. BMI, body mass index; AHI, apnea–hypopnea index; ArI, arousal index; ODI, oxygen desaturation index; SaO2, oxyhemoglobin saturation; REM, rapid eye movement.