Subjects n | Visit 1 | Visit 2 | Visit 3 | Visit 4 | p-value# | |
Smoker | 113 | 25 (22.1) | 85 (75.2) | 3 (2.7) | 0 (0) | 0.006 |
Nonsmoker | 233 | 29 (12.4) | 190 (81.5) | 7 (3.0) | 7 (3.0) | |
FEV1 >80% pred | 234 | 16 (6.8) | 205 (87.6) | 8 (3.4) | 5 (2.1) | <0.0001 |
FEV1 ≤80% pred | 112 | 38 (33.9) | 70 (62.5) | 2 (1.7) | 2 (1.7) |
Data are presented as n (%), unless otherwise stated. FEV1: forced expiratory volume in 1 s; % pred: % predicted. #: comparison between groups.