Baseline characteristics of sample stratified on country
| UK n=65 | USA n=74 | p Value | |
|---|---|---|---|
| Age | 69.8±9.2 | 70.4±8.0 | 0.44 |
| Male | 40 (62) | 53 (72) | 0.21 |
| FVC% | 80.7±18.7 n=55 | 70.1±17.7 n=70 | 0.002 |
| DLCO% | 42.2±11.9 n=38 | 43.2±16.5 n=47 | 0.75 |
| Supplemental O2 | 11 (18) | 38 (51) | <0.0001 |
| MRC dyspnoea | 0.007 | ||
| I | 2 (3) | 1 (1) | |
| II | 30 (46) | 16 (22) | |
| III | 12 (18) | 27 (36) | |
| IV | 3 (5) | 16 (22) | |
| V | 18 (28) | 14 (19) | |
| Dyspnoea-12 | 17.0±10.4 n=59 | 11.6±8.8 n=65 | 0.002 |
DLCO, diffusing capacity of the lung for carbon monoxide; FVC, forced vital capacity; MRC, Medical Research Council.