Table 1– Baseline characteristics of participants
CharacteristicsPart APart B
Participants n4215
Age years73±875±8
Females15 (36)8 (53)
Body mass index kg·m−227.4±526.7±4
FEV1 L1.4±0.51.4±0.4
FEV1 % pred59±1663±14
FVC L3.0±13.0±1
FVC % pred102±23102±22
FEV1/FVC %47±1350±15
TLC % pred103±16101±14
FRC % pred123±30113±33
RV % pred124±36118±34
DLCO % pred55±1658±9
Comorbidities % of total participants
 Coronary heart disease3313
 Systemic hypertension5527
 Absence of co-morbidities1020
 With 1 comorbidities1427
 With ≥2 comorbidities7653
  • Data are presented as mean±sd or n (%), unless otherwise stated. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; TLC: total lung capacity; FRC: functional residual volume; RV: residual volume; DLCO: diffusion capacity of the lung for carbon monoxide.