Table 3.
Correlations between changes in 6MWD with diaphragm excursion and baseline characteristics
| Independent variable | Total patients (n = 50) | |
|---|---|---|
| Pearson correlation | p value | |
| coefficient (r) | ||
| Age, year | − 0.10 | 0.48 |
| BMI, kg/m2 | − 0.02 | 0.89 |
| CAT | − 0.34 | 0.017 |
| FVC %predicted | 0.19 | 0.18 |
| FEV1 %predicted | 0.45 | 0.001 |
| 6MWD, m | 0.28 | 0.052 |
| mBorg scale dyspnoea | − 0.34 | 0.017 |
| PImax, cmH2O | 0.58 | < 0.001 |
| DEmax, mm | 0.72 | < 0.001 |
| QMS, kgf/kg | 0.31 | 0.028 |
BMI body mass index, CAT COPD assessment test, FVC forced vital capacity, FEV1 forced expiratory volume in 1 s, 6MWD 6-min walk distance, mBorg modified Borg, PImax maximum inspiratory pressure, DEmax maximum diaphragmatic excursion, QMS quadriceps muscle strength