TABLE 4

Annual change in lung function between the baseline and follow-up visit

<10 pack-years≥10 pack-yearsp-value
Subjects12865
ΔFEV1 mL·year–1−16.6 (−31.4–3.3)−25.0 (−41.7–0.9)0.052
ΔFEV1 % pred·year–10.40 (−0.16–1.06)0.08 (−0.48–0.78)0.022#
ΔFEV1/FVC·year–1−0.003 (−0.006–0.002)−0.003 (−0.007–0.001)0.452
ΔFVC mL·year–1−7.7 (−32.7–17.2)−16.6 (−44.3–15.7)0.143
ΔFVC % pred·year–10.59 (−0.09–1.28)0.33 (−0.08–1.15)0.227
  • Data are presented as n or median (interquartile range), unless otherwise stated. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity. #: statistically significant at p<0.05.