Table 1—

Characteristics of the study population

Sex F/M141/415
Age yr65±8
Height cm168±8
Weight kg66±13
Body mass index kg·m−223.2±4.4
FEV1 %36±13
IVC %73±18
Pa,O2 kPa8.9±1.6
Pa,CO2 kPa5.4±0.9
  • Data presented as mean±sd

  • F: Female

  • M: male

  • FEV1: forced expiratory volume in one second

  • IVC: inspiratory vital capacity

  • Pa,O2: arterial oxygen tension

  • Pa,CO2: arterial carbon dioxide tension.