Table 1.
Characteristics of All the Subjects, Responders, and Nonresponders
| Characteristics | All subjects (n = 152) | Responders (n = 105) | Nonresponders (n = 47) | P |
|---|---|---|---|---|
| Physical examination | ||||
| Age, y | 40 (35, 48) | 41 (37, 50) | 38 (32, 45) | .015* |
| Gender, male/female | 136/16 | 90/15 | 46/1 | .024* |
| Body mass index, kg/m2 | 27.0 (25.0, 29.4) | 27.0 (25.1, 29.2) | 26.8 (24.7, 29.4) | .922 |
| Tonsil size | 2 (2, 3) | 2 (2, 3) | 2 (1, 3) | .479 |
| Palate position | 3 (2, 3) | 3 (2, 3) | 3 (2, 3) | .603 |
| Neck circumference, cm | 40.0 (39.0, 42.0) | 40.0 (38.8, 42.0) | 40.0 (39.0, 42.0) | .865 |
| PSG parameters | ||||
| Preoperative AHI, events/h | 55.4 (38.2, 70.2) | 52.5 (37.6, 67.9) | 64.7 (41.0, 76.8) | .093 |
| NadirSpO2, % | 77.0 (68.3, 82.0) | 78.0 (69.5, 83.0) | 76 (67, 80) | .243 |
| CT90, % | 10.9 (2.9, 26.5) | 9.4 (2.52, 21.2) | 13.6 (3.4, 42.5) | .044* |
| CT parameters | ||||
| VmCSA, mm2 | 69.9 (48.7, 98.0) | 73.9 (52.6, 100.8) | 54.0 (44.0, 94.0) | .052 |
| GmCSA, mm2 | 205.7 (141, 257.7) | 211.5 (157.4, 259.0) | 177.0 (111.5, 255.2) | .088 |
| MH, mm | 13.3 (7.8, 19.3) | 12.7 (7.5, 17.6) | 15.7 (11.2, 24.2) | .014* |
| Friedman stage | .219 | |||
| Stage I | 24 (15.8%) | 20 (83.3%) | 4 (16.7%) | ‐ |
| Stage II | 55 (36.2%) | 38 (69.1%) | 17 (30.9%) | ‐ |
| Stage III | 73 (48.0%) | 47 (64.4%) | 26 (35.6%) | ‐ |
| Postoperative AHI, events/h | 11.6 (5.7, 21.8) | 7.9 (4.4, 12.9) | 25.2 (22.2, 36.4) | <.001* |
Values are presented as median (interquartile range) or numbers (percentage). *P < .05.
Abbreviations: AHI, apnea‐hypopnea index; CT, computed tomography; CT90, percentage of time with oxygen saturation below 90%; GmCSA, minimal cross‐sectional airway area of the glossopharynx; MH, the vertical distance between the lower edge of the mandible and the lower edge of the hyoid; PSG, polysomnography; VmCSA, minimal cross‐sectional airway area of the velopharynx.