| Variable in 2005 | Alive (n=74) | Died (n=43) | p |
| Age (years) | 59.6±9.7 | 67.8±9.9 | p=0.001 |
| BMI (kg/m2) | 26.1±4.7 | 24.1±3.8 | NS |
| FEV1 (% of pred.) | 71.2±17.9 | 56±19.5 | p=0.0004 |
| Severe and very severe obturation (n/%) | 11 (14.9%) | 14 (32.6%) | p=0.009 |
| Smokers (n/%) | 54 (73%) | 38 (88.4%) | NS |
| Packyears (n) | 35.2±19.9 | 41.4±27.1 | NS |
| MRC score (points) | 2.82±0.99 | 3.39±1.19 | p=0.015 |