Table 1.
Distribution of upper airway narrowing by OSA severity.
| Mild OSA group (AHI <15) |
Moderate-to-severe OSA group
(AHI ≥15) |
P | |
|---|---|---|---|
| Age, years [median (IQR)] | 45 (35–55) | 46 (37–55) | 0.168 |
| BMI, kg/m2 [median (IQR)] | 25.9 (23.7–28.2) | 28.4 (25.9–31.1) | 0.000 |
| NC, cm [median (IQR)] | 39 (36–41) | 41 (39–43) | 0.000 |
| RP regions collapse during Müller maneuver [median (IQR)] | 80% (64–100%) | 90% (75–100%) | 0.000 |
| RG regions collapse during Müller maneuver [median (IQR)] | 55% (50–75%) | 55% (50–75%) | 0.382 |
| Gender (male:female) | 203:73 | 624:102 | 0.000 |
| Nasal septum deviation (%) | 43.60% | 45.10% | 0.677 |
| Nasal stenosis (%) | 34.80% | 32.50% | 0.494 |
| Nasal turbinate hypertrophy (%) | 18.50% | 24.20% | 0.053 |
| Thick and long uvulas (%) | 39.90% | 50.10% | 0.004 |
| Tonsillar hypertrophy (%) | 2.30% | 10.70% | 0.000 |
| Lateral pharyngeal wall stenosis (%) |
7.70% | 19.00% | 0.000 |
| Tongue hypertrophy (%) | 42.70% | 57.70% | 0.000 |
| Tongue base hypertrophy (%) | 24.00% | 34.60% | 0.001 |
| Friedman score ≥3 (%) | 29.10% | 33.70% | 0.169 |
| Mandibular retrusion (%) | 41.20% | 55.70% | 0.000 |
| Morphology of the retropalatal region (long oval and quasicircular) (%) | 20.70% | 39.00% | 0.000 |
| Positive Müller maneuver in the RP region (%) | 72.50% | 83.70% | 0.000 |
| Positive Müller maneuver in the RG region (%) | 47.50% | 53.30% | 0.098 |
| Positive Müller maneuver in both the RP and RG regions (%) | 35.50% | 44.50% | 0.010 |
A positive Muller maneuver in the RP region was defined as more than 75% of the collapsed area. A positive Müller maneuver in the RG region was defined as more than 50% of the collapsed area.
OSA, obstructive sleep apnea; AHI, apnea-hypopnea index; RP, retropalate; RG, retroglottal; BMI, body mass index; NC, neck circumstance.
Data were expressed as the median (25th−75th percentile) or the percentage.