Annual change in lung function between Max0–2.5 and follow-up visit in group of patients with ≥10 pack-years of smoking, divided further by whether smoking continued after baseline or not
| ≥10 pack-years, smoking cessation at baseline | ≥10 pack-years, smoking continued after baseline | p-value | |
| Subjects | 28 | 37 | |
| ΔFEV1 mL·year–1 | −51.6 (−70.3– −27.4) | −54.1 (−79.9– −38.9) | 0.643 |
| ΔFEV1 % pred·year–1 | −0.64 (−1.26– −0.12) | −0.77 (−1.20– −0.43) | 0.740 |
| ΔFEV1/FVC·year–1 | −0.007 (−0.009– −0.004) | −0.005 (−0.010– −0.002) | 0.286 |
| ΔFVC mL·year–1 | −43.2 (−59.6– −5.0) | −41.7 (−66.1– −25.4) | 0.434 |
| ΔFVC % pred·year–1 | −0.04 (−0.40–0.90) | −0.40 (−0.75–0.25) | 0.077 |
Data are presented as n or median (interquartile range), unless otherwise stated. Max0–2.5: point of highest lung function (forced expiratory volume in 1 s (FEV1) % pred) during the first 2.5 years after baseline; FVC: forced vital capacity.