Association between exercise-related oxygen desaturation in response to 6-min step test (6MST) and submaximal and maximal cardiopulmonary exercise (CPETsubmax and CPETmax) tests
| 6MST | ||
| Yes | No | |
| ΔSp,O2 ≥4% | ||
| CPETmax | ||
| Yes | 24* | 1 |
| No | 4 | 2* |
| CPETsubmax | ||
| Yes | 25* | 1 |
| No | 3 | 2* |
| Sp,O2 <88% | ||
| CPETmax | ||
| Yes | 10* | 2 |
| No | 4 | 15* |
| CPETsubmax | ||
| Yes | 12* | 1 |
| No | 2 | 16* |
Data are presented as n. Sp,O2: arterial oxygen saturation measured by pulse oximetry; ΔSp,O2: resting Sp,O2–lowest exercise Sp,O2. *: p<0.05 (Chi-squared test).