Table 2.
Correlation between 6MWD and other functional markers
| Demographic and functional parameters | 6MWD |
|---|---|
| BODE-index | −0.6 |
| Alternative Scale | −0.56 |
| mMRC | −0.54 |
| CAT | −0.4 |
| IVC (L) | 0.34 |
| IVC% | 0.27 |
| Breath holding time | 0.24 |
| FEV1 | 0.22 |
| FVC | 0.22 |
| Grip strength | 0.2 |
| Chest wall expansion | 0.2 |
| Age | −0.18 |
| FEV1/FVC | 0.16 |
| BMI | 0.12 |
Abbreviations: 6MWD, 6-minute walking distance; BMI, body mass index; BODE-index, Body mass index, airflow Obstruction, Dyspnea and Exercise capacity; CAT, COPD Assessment Test; FEV1, forced expiratory volume in the first second; FVC, forced vital capacity; IVC, inspiratory vital capacity; mMRC, modified Medical Research Dyspnea Scale.