Table 2.
Polysomnography variables among patients undergoing routine sleep study.
| Variables | Mild OSA (n = 31) | Moderate OSA (n = 12) | Severe OSA (n = 19) | No OSA (n = 37) | P |
|---|---|---|---|---|---|
| AHI (events/h) | 1.90 [1.3, 3.5] | 8.4 [6.20 8.6] | 18.8 [13.5, 35.8] | 0.4 [0.2, 0.7] | <.001 |
| TST (min) | 402.0 [372.5, 421.7] | 388.0 [319.0, 416.2] | 370.0 [356.7, 393.2] | 408.0 [366.0, 432.0] | .09 |
| N3 (%) | 27.0 [23.5, 35.0] | 29.0 [24.0, 34.2] | 30.0 [25.5, 32.0] | 28.0 [22.0, 34.0] | .93 |
| REM (%) | 22.0 [17.0, 24.0] | 20.5 [16.0, 24.5] | 16.0 [13.5, 20.0] | 19.0 [17.0, 23.0] | .06 |
| Sleep efficiency (%) | 87.5 [83.2, 93.5] | 86.5 [81.0, 93.2] | 83.0 [77.5, 89.0] | 91.0 [81.0, 96.0] | .21 |
| Avg. SpO2 (%) | 98.0 [97.0, 98.0] | 97.0 [95.0, 98.0] | 96.0 [94.5, 97.0] | 98.0 [97.0, 98.0] | <.001 |
| Avg. ECO2 (mmHg) | 41.6 [38.7, 43.1] | 41.5 [37.0, 43.4] | 40.8 [39.3, 44.3] | 42.1 [38.9, 44.1] | .93 |
| WASO (min) | 33.0 [10.50, 40.7] | 40.0 [22.1, 70.7] | 47.0 [19.7, 82.0] | 22.0 [16.5, 51.0] | .23 |
| Arousals (events/h) | 62.0 [55.0, 104.0] | 104.5 [80.7, 138.0] | 123.5 [87.5, 172.7] | 69.0 [55.0, 92.0] | <.001 |
Data are presented as median [interquartile range]. AHI = apnea-hypopnea index, OSA = obstructive sleep apnea, REM = rapid eye movement, TST = total sleep time, WASO = wake after sleep onset.