Overall survival (univariate Cox regression)
| Factor | HR | 95% CI |
| Home NIV (vs no NIV) | 1.88 | 1.17 to 3.03 |
| Female sex | 1.23 | 0.99 to 1.51 |
| Age (per year) | 1.05 | 1.04 to 1.06 |
| Sedative drugs | 1.27 | 1.01 to 1.60 |
| Mean pCO2 | 1.00 | 0.99 to 1.01 |
| Mean bicarbonate | 1.01 | 0.99 to 1.03 |
| Discharge pCO2 | 1.00 | 0.99 to 1.01 |
| Discharge bicarbonate | 1.01 | 0.98 to 1.03 |
| Charlson Score | 0.98 | 0.91 to 1.06 |
| Cardiac failure | 1.33 | 1.06 to 1.69 |
| Chronic pulmonary disease | 0.70 | 0.57 to 0.87 |
| Obesity | 0.73 | 0.51 to 1.04 |
| Obstructive sleep apnoea | 0.41 | 0.23 to 0.73 |
| Unsupervised NIV | 2.54 | 1.48 to 4.33 |
| Supervised NIV | 0.96 | 0.52 to 1.74 |
NIV, non-invasive ventilation.