Table 1

Patients' characteristics

Group AGroup B
Patients n1311
Pa,O2 mmHg70±1063±8
O2 flow L·min−11.7
Pa,CO2 mmHg48±1041±4
pH7.41±0.0267.40±0.043
FEV1 pred %28±752±14
VC pred %66±1880±22
FEV1/FVC31±853±16
Nadir Sa,O2 % during 6MWT87.5±3.587.5±4
  • Data are presented as mean±sd

  • group A: patients already established on long-term oxygen therapy (LTOT)

  • group B: patients not on LTOT

  • Pa,O2: arterial oxygen tension

  • O2: oxygen

  • Pa,CO2: arterial carbon dioxide tension

  • FEV1: forced expiratory volume in one second

  • VC: vital capacity

  • FVC: forced vital capacity

  • Sa,O2: arterial oxygen saturation: 6MWT: 6-min walk test