Clinical, functional and symptomatic measures of the COPD group
| Mean±SD | Median | IQR | |
| FEV1% predicted (n=23) | 52.51±20.96 | 48.00 | 31.60 |
| 6mwd (m) (n=14) | 423.25±55.41 | 432.00 | 73.13 |
| PaO2 (kPa) (n=24) | 10.72±2.07 | 10.60 | 2.15 |
| PaCO2 (kPa) (n=24) | 5.09±0.47 | 5.01 | 0.67 |
| MRC dyspnoea scoren p (n=21) | – | 2 | 1 |
| SGRQ (n=22) | 51.65±19.98 | 49.66 | 30.33 |
6mwd, 6 min walking distance; COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; MRC, Medical Research Council; np, non-parametric; PaCO2, partial pressure of carbon dioxide in arterial blood; PaO2, partial pressure of oxygen in arterial blood; SGRQ, St George’s Respiratory Questionnaire.