| Variables | Frequency N = 13 | Percentage (%) |
| Type of surgery |
|
|
| Urgent | 3 | 23.1 |
| Elective | 10 | 76.9 |
| Type of anesthesia |
|
|
| GA + OTI | 5 | 38.5 |
| GA + Selective intubation | 8 | 61.5 |