Table 2.
Polysomnography findings of all participants.
| Parameter | All (n = 100) |
Normal to Moderate OSAS (n = 63) |
Severe OSAS (n = 37) |
Female (n = 39) |
Male (n = 61) |
Non-Obese (n = 50) |
Obese (n = 50) |
|---|---|---|---|---|---|---|---|
| AHI (events/hour) b | 23.9 ± 23.5 | 8.9 ± 8.6 | 49.5 ± 18.1 | 24.2 ± 23.0 | 23.8 ± 24.1 | 20.7 ± 19.3 | 27.2 ± 26.9 |
| >30 | 37 (37%) | 0 (0%) | 37 (100%) | 15 (38.5%) | 22 (36.1%) | 18 (36%) | 19 (38%) |
| ≤30 | 63 (63%) | 63 (100%) | 0 (0%) | 24 (61.5%) | 39 (63.9%) | 32 (64%) | 31 (62%) |
| OAI (events/hour) κ,b | 8.9 ± 13.2 | 2.6 ± 4.3 | 19.4 ± 16.4 | 7.6 ± 10.0 | 9.7 ± 15.0 | 8.4 ± 10.0 | 9.3 ± 16.0 |
| CAI (events/hour) κ,b | 1.3 ± 2.6 | 0.6 ± 1.9 | 2.5 ± 3.2 | 1.0 ± 1.9 | 1.5 ± 2.9 | 1.8 ± 3.3 | 0.8 ± 1.6 |
| MAI (events/hour) κ,b,c | 1.5 ± 6.2 | 0.2 ± 0.7 | 3.8 ± 9.9 | 0.2 ± 0.4 | 2.4 ± 7.9 | 1.7 ± 7.7 | 1.3 ± 4.3 |
| HI (events/hour) κ,a,b | 12.4 ± 14.1 | 5.7 ± 5.1 | 24.0 ± 16.8 | 15.5 ± 17.8 | 10.5 ± 10.8 | 8.8 ± 9.0 | 16.1 ± 17.1 |
| Arousal index (events/hour) κ,b |
16.5 ± 18.3 | 7.4 ± 5.9 | 31.9 ± 21.7 | 15.4 ± 6.9 | 17.1 ± 19.2 | 14.5 ± 14.1 | 18.3 ± 21.6 |
| Stages of sleep | |||||||
| N1 (%) κ,a,b | 24.3 ± 14.3 | 20.6 ± 11.3 | 30.5 ± 16.7 | 23.2 ± 14.0 | 25.0 ± 14.6 | 21.0 ± 12.4 | 27.6 ± 15.5 |
| N2 (%) | 50.2 ± 12.9 | 50.5 ± 11.0 | 49.7 ± 15.4 | 48.7 ± 14.1 | 51.1 ± 11.9 | 50.7 ± 11.8 | 49.7 ± 13.8 |
| N3 (%) b,c | 12.8 ± 8.9 | 15.2 ± 9.0 | 8.6 ± 7.1 | 15.5 ± 8.7 | 11.1 ± 8.7 | 14.2 ± 9.4 | 11.4 ± 8.3 |
| R (%) κ | 12.7 ± 6.5 | 13.6 ± 6.0 | 11.1 ± 7.0 | 12.6 ± 6.9 | 12.7 ± 6.2 | 14.1 ± 5.8 | 11.4 ± 6.8 |
| Sleep efficiency (%) κ | 86.4 ± 11.0 | 86.9 ± 10.6 | 85.5 ± 11.7 | 85.4 ± 13.0 | 87.0 ± 9.5 | 87.4 ± 10.1 | 85.4 ± 11.7 |
| SpO2nadir (%) κ,b | 81.3 ± 9.4 | 85.3 ± 6.4 | 74.4 ± 9.9 | 81.6 ± 10.2 | 81.1 ± 9.0 | 83.1 ± 8.2 | 79.5 ± 10.3 |
| SpO2mean a,b | 94.1 ± 4.0 | 95.7 ± 1.4 | 91.5 ± 5.4 | 94.2 ± 5.4 | 94.1 ± 2.8 | 94.9 ± 2.4 | 93.3 ± 5.0 |
| TST (min) κ | 324.8 ± 44.0 | 328.0 ± 42.2 | 319.1 ± 47.0 | 320.4 ± 48.2 | 327.6 ± 41.2 | 331.7 ± 42.7 | 317.8 ± 44.5 |
| ESS | 10.2 ± 4.4 | 9.7 ± 4.5 | 11.1 ± 4.3 | 10.4 ± 4.6 | 10.0 ± 4.4 | 9.6 ± 4.3 | 10.8 ± 4.6 |
ap < 0.05 between the non-obese and obese groups. b p < 0.05 between the normal to moderate and severe OSAS groups. c p < 0.05 between the male and female groups. κ The comparison was based on log10 transformation. Abbreviations: AHI, apnea-hypopnea index; CAI, central apnea index; ESS, Epworth sleepiness scale; HI, hypopnea index; MAI, mixed apnea index; OAI, obstructive apnea index; OSAS, obstructive sleep apnea syndrome; R, rapid eye movement; SpO2mean, the average oxygen saturation during sleep; SpO2nadir, the lowest oxygen saturation during sleep.