TABLE 1

Demographic and clinical characteristics of the individuals

NonsmokersSmokersCOPDECOPDRecovery
Subjects1515385641
Age years66±1.460±2.062±1.268.9±1.268.1±1.3
BMI kg·m−227.1±0.824.6±1.426.2±0.826.5±0.826.3±0.8
Cumulative smoking exposure pack-years052.8±5.761.3±4.772.9±4.872.7±5.3
Smoking status ex/current00/1526/1221/3519/29
FEV1 % reference#94.3±5.282.4±3.642.4±2.944.4±2.844.4±2.8
FEV1/FVC %#76.4±1.783.0±0.644.1±2.446.7±2.047.1±2.3
  • Data are presented as n or mean±sem, unless otherwise stated. COPD: chronic obstructive pulmonary disease; ECOPD: exacerbations of COPD; BMI: body mass index; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity. #: FEV1 % reference and FEV1/FVC values for nonsmokers and smokers are pre-bronchodilator, and for COPD patients are post-bronchodilator.