| Flow from medium concentration mask | Oxygen only(no of patients) | Oxygen and nebuliser(no of patients) |
| 2 l/min (approx 28% oxygen) | 1 | 1 |
| 4 l/min (approx 35–40% oxygen) | 4 | 1 |
| 5 l/min (>40% oxygen) | 2 | 0 |
| 6 l/min (>40% oxygen) | 5 | 6 |
| 7 l/min (>40% oxygen) | 0 | 1 |
| 8 l/min (>40% oxygen) | 1 | 2 |
| 10 l/min (>40% oxygen) | 1 | 1 |
| Total | 14 | 12 |