Characteristics of patients with and without somnolence at follow-up

Somnolence at follow-upNo somnolence at follow-upp-value
Subjects n2412
Gender male11 (46)6 (59)0.813
Somnolence at admission22 (92)8 (67)0.058
PCO2 at admission kPa6.6 (5.1–11.8)6.9 (6–8.6)0.470
PCO2 at follow-up kPa6.1 (4.9–7.8)5.8 (4.9–7.0)0.097
NIV hours at follow-up1.6 (0–9.7)4.8 (0–10.4)0.038
FEV1 % pred65 (25–102)69 (32–83)0.540
FVC % pred63 (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.