Patients' characteristics
| Group A | Group B | |
| Patients n | 13 | 11 |
| Pa,O2 mmHg | 70±10 | 63±8 |
| O2 flow L·min−1 | 1.7 | |
| Pa,CO2 mmHg | 48±10 | 41±4 |
| pH | 7.41±0.026 | 7.40±0.043 |
| FEV1 pred % | 28±7 | 52±14 |
| VC pred % | 66±18 | 80±22 |
| FEV1/FVC | 31±8 | 53±16 |
| Nadir Sa,O2 % during 6MWT | 87.5±3.5 | 87.5±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