Table 1. Study population at baseline.
| ≥ 75 (n = 82) | < 75 (n = 182) | p value | |
|---|---|---|---|
| Women | 38 (46) | 76 (42) | 0.7 |
| BMI, kg/m2 | 35 (10) | 36 (13) | 0.4 |
| Cardiovascular comorbidities | 71 (87) | 111 (61) | <0.0001 |
| Smokers | 32 (39) | 107 (59) | 0.003 |
| LTOT | 23 (28) | 44 (24) | 0.4 |
| Obstructive disorder | 19 (23) | 56 (31) | 0.2 |
| Restrictive disorder | 18 (22) | 53 (29) | 0.2 |
| OHS | 43(52) | 67 (37) | 0.02 |
| NIV initiation in ICU | 27 (33) | 69 (38) | 0.4 |
| FEV1, % of predicted | 66 (22) | 64 (24) | 0.6 |
| FVC, % of predicted | 71 (20) | 73 (20) | 0.6 |
| FEV1/FVC, % | 70 (18) | 70 (16) | 0.8 |
| IPAP, cm H2O | 19.9 (2) | 19.9 (4) | 0.9 |
| EPAP, cm H2O | 8.1 (3) | 7.7 (2) | 0.4 |
| Min RR | 14.6 (2) | 14.9 (2) | 0.3 |
| Full-face mask | 69 (84) | 157 (86) | 0.7 |
Values expressed as mean (SD) or n (%). BMI = body mass index, LTOT = long-term oxygen therapy, OHS = obesity hypoventilation syndrome, ICU = intensive care unit, FEV1 = forced expiratory volume in 1 s, FVC = forced vital capacity, IPAP = inspiratory partial airway pressure, EPAP = expiratory partial airway pressure, Min RR = minimal respiratory rate