| Oxygen flow L/min | FIO2 (Ventilator 02 inlet) | FIO2 (T-ring) |
| 0.25 | 0.217 ± 0.1 | 0.212 ± 0.0 |
| 0.5 | 0.22 ± 0.1 | 0.215 ± 0.1 |
| 0.75 | 0.228 ± 0.2 | 0.223 ± 0.4 |
| 1 | 0.235 ± 0.1 | 0.232 ± 0.3 |
| 2 | 0.26 ± 0.1 | 0.273 ± 1.3 |
| 3 | 0.286 ± 0.1 | 0.366 ± 2.1* |
| 4 | 0.31 ± 0.1 | 0.438 ± 0.3# |
*P = 0.004 #P < 0.0001