| All patients (n = 59) | |
| Age (years) | 70 (9) |
| Male (n (%)) | 33 (56) |
| Smoking history (pack-years) | 40.8 (26.3) |
| FEV1 (l) | 0.9 (0.4) |
| FEV1% predicted | 37.2 (14.9) |
| FVC (l) | 1.9 (0.9) |
| FVC% predicted | 62.1 (17.6) |
| BMI (kg/m2) | 26.0 (6.5) |
| Resting Pao2 (kPa) | 8.9 (1.2) |
| Resting Paco2 (kPa) | 5.6 (0.9) |
| Resting saturation (%) | 92.8 (1.8) |
| Minimum nocturnal saturation (%) | 86.5 (53.6) |
| MNS (%) | 91.2 (2.7) |
| TB90% | 34.8 (34.9) |
BMI, body mass index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; MNS, mean nocturnal saturation; Pao2, arterial oxygen tension; Paco2, arterial carbon dioxide tension; TB90%, time spent with saturation below 90%.