Table 1.
Changes in variables of PSG, and CBCT data between the T0 and T1 stages.
| Variables | N | T0 | T1 | Wilcoxon Z | Adjusted P Value* | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Median | Min. | Max. | Median | Min. | Max. | |||||
| PSG data | AHI (number/h) | 50 | 1.15 | 0.00 | 12.40 | 1.10 | 0.00 | 28.70 | −2.396 | 0.391 |
| RDI (number/h)** | 50 | 4.10 | 0.20 | 21.20 | 6.60 | 0.10 | 41.20 | −3.482 | <0.001 | |
| BMI (kg/m2)** | 50 | 22.65 | 15.30 | 33.30 | 22.45 | 14.90 | 33.30 | −4.041 | <0.001 | |
| Total sleep time (minutes) | 50 | 401.50 | 205.00 | 462.30 | 409.75 | 167.00 | 475.90 | −1.168 | 1.000 | |
| Sleep efficiency (%) | 50 | 86.75 | 40.70 | 97.60 | 91.15 | 33.60 | 98.20 | −2.018 | 1.000 | |
| Wake after sleep onset (minutes) | 50 | 50.50 | 7.40 | 280.50 | 30.25 | 5.00 | 322.50 | −2.528 | 1.000 | |
| Number of awakening | 50 | 26.00 | 4.00 | 68.00 | 26.00 | 10.00 | 61.00 | −1.626 | 1.000 | |
| N1 stage percentage (%) | 50 | 9.45 | 2.40 | 30.40 | 9.30 | 1.20 | 29.10 | −1.651 | 1.000 | |
| N2 stage percentage (%) | 50 | 56.35 | 33.10 | 70.10 | 57.40 | 36.50 | 71.50 | −0.275 | 1.000 | |
| N3 stage percentage (%) | 50 | 14.50 | 0.00 | 32.70 | 13.70 | 0.00 | 27.10 | −1.646 | 1.000 | |
| REM stage percentage (%) | 50 | 17.55 | 3.80 | 27.60 | 19.60 | 9.30 | 32.90 | −2.636 | 0.184 | |
| Total arousal index (number/h) | 50 | 14.90 | 5.30 | 30.10 | 15.30 | 6.70 | 34.30 | −0.285 | 1.000 | |
| Total RERA index (number/h)** | 50 | 2.55 | 0.00 | 16.20 | 4.70 | 0.00 | 16.60 | −3.498 | <0.001 | |
| Relative snoring time (%) | 50 | 3.40 | 0.00 | 52.80 | 8.70 | 0.00 | 71.00 | −2.578 | 0.230 | |
| Mean oxygen saturation (%) | 50 | 97.20 | 94.80 | 98.20 | 97.60 | 95.40 | 98.60 | −2.721 | 0.161 | |
| Lowest oxygen saturation (%) | 50 | 93.00 | 85.00 | 96.00 | 94.00 | 76.00 | 97.00 | −0.103 | 1.000 | |
| Average oxygen saturation during wake (%) | 50 | 97.70 | 95.40 | 98.60 | 97.85 | 96.20 | 98.70 | −2.065 | 0.897 | |
| Average oxygen saturation during NREM (%) | 50 | 97.20 | 94.60 | 98.10 | 97.60 | 95.30 | 98.60 | −2.848 | 0.368 | |
| Average oxygen saturation during REM (%) | 50 | 97.35 | 95.60 | 98.60 | 97.80 | 94.70 | 98.60 | −2.381 | 1.000 | |
| CBCT data | Volume of total pharyngeal airway space (cc)** | 50 | 23.85 | 9.50 | 61.30 | 20.03 | 6.35 | 42.95 | −4.148 | <0.001 |
| Volume of nasopharyngeal airway space (cc) | 50 | 5.78 | 1.85 | 12.35 | 5.25 | 1.45 | 12.20 | −2.472 | 0.299 | |
| Volume of oropharyngeal airway space (cc)** | 50 | 7.88 | 2.75 | 23.30 | 6.80 | 0.90 | 14.25 | −3.862 | <0.001 | |
| Volume of hypopharyngeal airway space (cc)** | 50 | 9.18 | 1.80 | 30.95 | 8.53 | 2.35 | 25.35 | −3.543 | <0.001 | |
*Statistical analysis was carried out using Wilcoxon-signed rank test (before vs. after surgery), and Bonferroni adjustment was applied for multiple comparison correction. **Variables examined by performing one-tailed test (before vs. after surgery).