Ventilation performance analysis during the 5 min ventilation tests (n=280 tests for each ventilation technique)
| Ventilation performance | Facemask (mean (%)) | ETT (mean (%)) |
| Adequate ventilation | 21 (7.5) | 37 (13.21) |
| Hypoventilation | 37 (13.21) | 27 (9.64) |
| Hyperventilation | 222 (79.29) | 216 (77.14) |
ETT, endotracheal tube.