Demographics of subjects in the NELSON study
| n=2253 | |
| Age (SD) | 59.8 (5.3) |
| Follow-up years* | 3.0 (2.9–3.1) |
| Pack-years (SD) | 40.2 (17.6) |
| FEV1/FVC <0.70 (%) | 33 |
| Smoking status | |
| Current smoker (%) | 1253 (55.6) |
| Former smoker (%) | 1000 (44.4) |
↵* Median (IQR).
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.