Characteristics of obesity hypoventilation syndrome (OHS) and obstructive sleep apnoea (OSA) patients
| OHS | OSA | p-value | |
| Patients n | 206 | 236 | |
| Women % | 41.3% | 24.2% | <0.001 |
| BMI kg·m−2 | 46.1 | 32.2 | <0.001 |
| CCI score | 3.1 | 1.6 | <0.001 |
| Age years | 56.3 | 52.3 | <0.001 |
| PaO2 kPa | 7.9 | 10.2 | <0.001 |
| PaCO2 kPa | 7.0 | 5.3 | <0.001 |
| Awake SpO2 | 91.0% | 94.9% | <0.001 |
| Mean SpO2 | 84.8% | 93.2% | <0.001 |
| REI h−1 | 60.1 | 32.3 | <0.001 |
| ODI3 h−1 | 65.31 | 26.1 | 0.253 |
| ODI4 h−1 | 61.3 | 29.8 | <0.001 |
| ESS score | 10.7 | 9.2 | 0.033 |
Data are presented as means unless otherwise stated. BMI: body mass index; CCI: Charlson Comorbidity Index; PaO2: arterial oxygen tension; PaCO2: arterial carbon dioxide tension; SpO2: oxygen saturation measured by pulse oximetry; REI: respiratory event index; ODI3: ≥3% oxygen desaturation index; ODI4: ≥4% oxygen desaturation index; ESS: Epworth Sleepiness Scale.