Table 3.
Multiple variable analysis of factors influencing the first-pass intubation success rates
| Factors | ORs | 95% CIs | P value |
| Laryngoscopes | |||
| Macintosh (reference) | 1 | – | – |
| Pentax-Airway Scope | 3.422 | 1.551 to 7.550 | 0.002 |
| King VISION | 1.056 | 0.487 to 2.289 | 0.889 |
| McGrath Mac | 3.758 | 1.640 to 8.612 | 0.002 |
| Indications for tracheal intubation | |||
| Cardiopulmonary arrest | 1 (reference) | ||
| Airway obstruction | 0.226 | 0.063 to 0.812 | 0.023 |
| Respiratory failure | 0.720 | 0.284 to 1.822 | 0.488 |
| Haemodynamic instability | 0.380 | 0.137 to 1.054 | 0.063 |
| Altered mental status | 0.361 | 0.180 to 0.723 | 0.004 |
| Difficult airway characteristics | |||
| Mouth opening | |||
| Unlimited | 1 (reference) | – | – |
| Limited | 0.092 | 0.026 to 0.323 | 0.000 |
| Neck mobility | |||
| Unrestricted | 1 (reference) | – | – |
| Restricted | 0.951 | 0.414 to 2.182 | 0.905 |
| Blood, secretions, vomitus in the airways | |||
| Absent | 1 (reference) | – | – |
| Present | 0.455 | 0.257 to 0.804 | 0.007 |
| Operators | |||
| Non-expert | 1 (reference) | – | – |
| Expert | 1.688 | 0.916 to 3.108 | 0.093 |