Baseline (t0) mean±sd, median and range values in the 64 patients
| Variables | Mean±sd | Median | Range |
| Age yrs | 64.6±8.1 | 63.6 | 38.7–79.1 |
| BMI kg·m−2 | 26.6±5.2 | 25.8 | 17.0–37.1 |
| VC % pred | 77.0±17.3 | 78.5 | 33.5–112.0 |
| FEV1 % pred | 35.4±11.1 | 34.9 | 16.2–67.6 |
| FEV1/VC % | 35.6±9.6 | 35.2 | 16.1–63.2 |
| TLC % of pred | 108.4±20.1 | 106.8 | 80.4–154.7 |
| Pa, O2 mmHg | 63.4±3.1 | 62.9 | 58–69 |
| Pa,CO2 mmHg | 43.1±5.0 | 43.0 | 34.9–54.9 |
| mPAP rest mmHg | 19.0±4.9 | 18.0 | 11.0–32.0 |
| PWP mmHg | 8.4±3.4 | 8.0 | 3.0–19 |
| Cardiac output L·min−1·m−2 | 3.01±0.79 | 2.8 | 20.3–6.00 |
| TST min | 313±86 | 325 | 181–480 |
| REM % | 14±6 | 14 | 2.5–30 |
| Mean nocturnal Sa,O2 % | 89.6±3.3 | 90.0 | 74–95 |
| tSa,O2<90% % | 41.7±36.2 | 34.0 | 1.0–100 |
| tSa,O2<80% % | 3.1±13.0 | 0 | 0–36.3 |
| Sa,O2 min % | 77±12 | 82 | 45–91 |
BMI: body mass index
VC: vital capacity
FEV1: forced expiratory in one second
TLC: total lung capacity
Pa,O2: arterial oxygen partial pressure
Pa,CO2: arterial carbon dioxide partial pressure
mPAP: mean pulmonary artery pressure
PWP: pulmonary “capillary” wedge pressure
TST: total sleep time
REM: rapid eye movement sleep time as a percentage of TST
Sa,O2: arterial oxygen saturation
tSa,O2 <90% (80%): percentage of recording time spent with an Sa,O2 <90% (80%)
Sa,O2 min: lowest nocturnal Sa,O2