Univariate analysis relating survival time to selected baseline variables
| Hazard ratio (95% CI) | p-value | |
| Sex (female) | 1.017 (0.573–1.806) | 0.954 |
| Age | 1.004 (0.977–1.031) | 0.794 |
| WHO/NYHA functional class IV | 2.010 (1.052–3.840) | 0.034 |
| 6MWD | 0.995 (0.993–0.997) | <0.001 |
| RAP | 0.930 (0.861–1.005) | 0.066 |
| mPAP | 0.997 (0.968–1.027) | 0.834 |
| Cardiac index | 1.401 (0.994–1.976) | 0.054 |
| PVR | 0.966 (0.898–1.039) | 0.350 |
| FVC | 0.984 (0.969–0.999) | 0.042 |
| KCO | 0.982 (0.968–0.996) | 0.013 |
| Radiological stage IV | 1.845 (0.954–3.559) | 0.069 |
| PAH-targeted therapy | 0.845 (0.526–2.650) | 0.684 |
WHO: World Health Organization; NYHA: New York Heart Association; 6MWD: 6-min walk distance; RAP: right atrial pressure; mPAP: mean pulmonary artery pressure; PVR: pulmonary vascular resistance; FVC: forced vital capacity; KCO: transfer coefficient of the lung for carbon monoxide; PAH: pulmonary arterial hypertension.