Percentage fall in heart rate (HR) and percentage fall in arterial oxygen saturation (Sa,O2) for the two exercise tests.
| 6-min walk | 3-min step | p-value | |
| Percentage rise in HR | 18 (13–26) | 30 (20–36) | <0.0005 |
| Percentage fall in Sa,O2 | 2 (1–4) | 4 (2–6) | 0.002 |
Data are presented as medians (interquartile ranges)