The main data are provided for 900 subjects who completed the study (500 smokers, 200 ex-smokers, and 200 never-smokers). Missing data were not replaced. Subject ID (ID), study group, gender, age, eth
Data are presented as median (interquartile range). M/F: male/female; FEV1: forced expiratory volume in one second; % pred: % predicted; FVC: forced vital capacity. 1: Stage 0 COPD is defined as FEV1,
Data are expressed as mean ± std. FEV1; forced expiratory volume in 1 s, FVC; forced vital capacity, 6 MWD; six-minute walking distance, MRC; Medical Research Council, CAT; COPD Assessment Test, SGRQ;