| Group A Mean (SD) n=22 | Group B Mean (SD) n=21 | |
| Age | 53.1 (8.6) | 50.4 (9.2) |
| Males (%) | 91 | 71 |
| Pack year history | 20.0 (15.7) | 18.1 (18.2) |
| Total SGRQ | 56.5 (16.8) | 40.8 (11.3)* |
| Follow-up, years | 5.7 (2.5) | 6.0 (1.9) |
| Baseline FEV1 (L) | 1.53 (0.5) | 1.44 (0.5) |
| Baseline FEV1 SR | −3.83 (1.1) | −3.87 (1.1) |
| Last FEV1 SR | −3.95 (0.9) | −4.04 (1.1) |
| FEV1 change (L/year) | −0.038 (0.03) | −0.036 (0.05) |
| Baseline K,co (mmol/min/kPa/L) | 1.38 (0.2) | 1.34 (0.2) |
| Baseline K,co SR | −0.53 (0.5) | −1.01 (0.5)** |
| Last K,co SR | −0.95 (0.7) | −2.19 (0.6)* |
| K,co change (mmol/min/kPa/L/year) | −0.034 (0.02) | −0.061 (0.03)** |
* p<=0.001, **p<=0.005.