6MWT* functional class | N (%) | Average distance, m ± SD** |
I | 32 (45.7) | 437.8 ± 95.8 |
II | 22 (31.4) | 360.1 ± 96.4 |
III | 13 (18.5) | 248.4 ± 98.3 |
IV | 3 (4.4) | 150.1 ± 104.3 |