Table 1– Characteristics of the subject population
NonsmokersSmokers without airflow obstructionCOPD
Subjects n91016
Age years51.5±4.745.4±2.966.7±3.3
Pack years29.6±4.131.1±7.2
Current cigarette consumption17.6±2.114.4±3.9
FEV1 L2.89±0.212.42±0.141.56±0.24
FEV1 % pred97.3±6.288.4±3.756.1±3.2
FEV1/FVC %85.1±2.982.4±3.456.5±6.2
ICS treatment n0015
LABA treatment n0015
  • Data are presented as mean±sem, unless otherwise stated. COPD: chronic obstructive pulmonary disease; FEV1: forced expiratory volume in 1 s; % pred: % predicted; FVC: forced vital capacity; ICS: inhaled corticosteroid; LABA: long-acting β-agonist.