Parameters of patients according to stages of OSAS and control group
| Parameters | Control Group (n = 24) (mean ± SD) | Mild/Moderate OSAS (n = 27) (mean ± SD) | Severe OSAS (n = 20) (mean ± SD) | P* Value |
|---|---|---|---|---|
| Age (y) | 46.0 ± 14.3 | 49.0 ± 6.0 | 49.0 ± 10.0 | .533 |
| BMI (kg/m2) | 34.1 ± 7.0 | 33.9 ± 5.7 | 31.7 ± 5.1 | .357 |
| Neck circumference (cm) | 37.4 ± 4.4 | 38.3 ± 4.2 | 40.6 ± 3.8 | .043 |
| AHI | 2.1 ± 1.4 | 13.9 ± 6.7 | 50.8 ± 15.6 | .000 |
| Uvula tidal breathing area (mm2) | 233.2 ± 89.9 | 224.7 ± 68.6 | 202.8 ± 76.7 | .418 |
| Uvula inspiration area (mm2) | 215.2 ± 94.3 | 247.4 ± 107.6 | 205.7 ± 146.7 | .425 |
| Uvula expiration area (mm2) | 205.6 ± 106.3 | 219.6 ± 82.7 | 137.2 ± 73.6 | .007 |
| Hypopharynx tidal breathing area (mm2) | 349.2 ± 117.8 | 257.1 ± 88.7 | 366.2 ± 137.2 | .453 |
| Hypopharynx inspiration area (mm2) | 333.8 ± 118.4 | 338.6 ± 131.8 | 345.6 ± 146.8 | .698 |
| Hypopharynx expiration area (mm2) | 272.8 ± 107.5 | 323.6 ± 150.0 | 307.0 ± 140.2 | .344 |
| MP-H (mm) | 15.0 ± 5.7 | 15.2 ± 6.4 | 20.0 ± 8.1 | .029 |
| PNS-U (mm) | 35.0 ± 3.6 | 34.9 ± 4.1 | 37.5 ± 6.1 | .120 |
| SP-max (mm) | 10.0 ± 2.0 | 9.6 ± 2.2 | 11.6 ± 2.2 | .009 |
| SNA (angle) | 81.5 ± 4.9 | 81.3 ± 6.2 | 84.0 ± 5.0 | .211 |
| SNB (angle) | 79.3 ± 4.0 | 79.1 ± 5.1 | 81.1 ± 5.3 | .347 |
| ANB (angle) | 2.1 ± 3.6 | 1.9 ± 3.4 | 2.9 ± 3.4 | .628 |
Note.—OSAS indicates obstructive sleep apnea syndrome; AHI, apnea-hypopnea index; MP-H, distance from mandibulas plane to the hyoid bone; PNS-U, distance from the posterior nasal spine to the tip of the uvula; SP-max, maximum distance of the soft palate perpendicular to PNS-U; SNA, SNB, ANB, angles where S is the midpoint of the sella, N is the nasion, A is the deepest point on the premaxillary outer contour, and B is the deepest point on the outer mandibular contour.
* Compared by using the one-way ANOVA. Significant values are shown in boldface.