Characteristics of patients with and without somnolence at follow-up
| Somnolence at follow-up | No somnolence at follow-up | p-value | |
| Subjects n | 24 | 12 | |
| Age | 49.3±9.5 | 42.9±17.7 | 0.171 |
| Gender male | 11 (46) | 6 (59) | 0.813 |
| Somnolence at admission | 22 (92) | 8 (67) | 0.058 |
| PCO2 at admission kPa | 6.6 (5.1–11.8) | 6.9 (6–8.6) | 0.470 |
| PCO2 at follow-up kPa | 6.1 (4.9–7.8) | 5.8 (4.9–7.0) | 0.097 |
| NIV hours at follow-up | 1.6 (0–9.7) | 4.8 (0–10.4) | 0.038 |
| FEV1 % pred | 65 (25–102) | 69 (32–83) | 0.540 |
| FVC % pred | 63 (34–111) | 69 (27–79) | 0.606 |
Data are presented as mean±sd, n (%) or median (range), unless otherwise stated. Values in bold represent statistically significant results. PCO2: carbon dioxide tension; NIV: noninvasive ventilation; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity.