Table 2 Pulse oxygen saturation and emergent management
|  | Mouthpiece group (n = 180) | Airway group (n = 180) | P-value |
|---|---|---|---|
Pulse oxygen saturation | Â | Â | Â |
 Subclinical respiratory depression,pulse oxygen saturation of 90–94% (%) | 19 (10.6) | 9 (5.0) | 0.049 |
 Mild hyoxemia, pulse oxygen saturation of 85–89% (%) | 22 (12.2) | 8 (4.4) | 0.008 |
 Moderate hyoxemia, pulse oxygen saturation < 85% (%) | 2 (1.1) | 0 (0.0) | 0.156 |
Emergency management | Â | Â | Â |
 Lifting the mandible (%) | 25 (13.9) | 11 (6.1) | 0.014 |
 Enhancing oxygen flow (%) | 43 (23.9) | 17 (9.4) | 0.000 |
 Withholding endoscopy (%) | 17 (9.4) | 6 (3.3) | 0.018 |
 Effective suction secretions and reflux (%) | 5 (2.8) | 15 (8.3) | 0.021 |
 Removing the endoscopy tube and mask ventilation (%) | 2 (1.1) | 0 (0.0) | 0.156 |