Subject preference for first or second measurement based on duration, breathing comfort and dyspnoea sensation and overall preference
| Measurement 1 | Measurement 2 | |||||
| Rebreathing | Steady-state | No preference | Rebreathing | Steady-state | No preference | |
| Duration | 25 | 50 | 25 | 25 | 55 | 20 |
| Breathing comfort | 20 | 80 | 0 | 20 | 75 | 5 |
| Dyspnoea sensation | 15 | 70 | 15 | 10 | 85 | 5 |
| Overall preference | 20 | 80 | 20 | 80 | ||
Data are presented as %.