Clinical features | Mean (range) |
Age years | 52 (42–61) |
Male % | 60 (49–90) |
Body mass index kg·m−2 | 44 (35–56) |
Neck circumference cm | 46.5 (45–47) |
pH | 7.38 (7.34–7.40) |
Arterial PCO2 mmHg | 53 (47–61) |
Arterial PO2 mmHg | 56 (46–74) |
Serum bicarbonate mEq·L−1 | 32 (31–33) |
Haemoglobin g·dL−1 | 15 |
Apnoea–hypopnoea index | 66 (20–100) |
SpO2 nadir during sleep % | 65 (59–76) |
Per cent sleep time SpO2 <90% | 50 (46–56) |
FVC % predicted | 68 (57–102) |
FEV1 % predicted | 64 (53–92) |
FEV1/FVC | 0.77 (0.74–0.88) |
Medical Research Council Dyspnoea class 3 or 4 % | 69 |
Epworth sleepiness scale score | 14 (12–16) |
PCO2: carbon dioxide tension; PO2: oxygen tension; SpO2: arterial oxygen saturation measured by pulse oximetry; FVC: forced vital capacity; FEV1: forced expiratory volume in 1 s. Reproduced from [1] with permission from the publisher.