Ventilation parameter values measured during all the 5 min ventilation tests (n=280 tests for each ventilation technique)
| Variable | Facemask | ETT | ||||
| Mean±SD | Lower quartile | Upper quartile | Mean±SD | Lower quartile | Upper quartile | |
| Ventilation rate (VR, bpm) | 24.09±9.47 | 17.2 | 29.09 | 23.60±9.66 | 16.27 | 29.09 |
| Tidal volume (VT, mL) | 333.94±124.19 | 245.6 | 419.95 | 462.31±155.42 | 361.4 | 545.01 |
| Inspiratory time (Itime, s) | 0.76±0.26 | 0.58 | 0.89 | 0.88±0.34 | 0.66 | 1.03 |
| Expiratory time (Etime, s) | 2.10±1.19 | 1.28 | 2.53 | 2.17±1.31 | 1.27 | 2.63 |
ETT, endotracheal tube.