Clinical baseline characteristics
| Age years | 64.1±14.5 |
| Male sex % | 37.9 |
| BMI kg·m−2 | 26.6±5.3 |
| WHO functional class % | |
| I | 7.4 |
| II | 64.2 |
| III | 28.4 |
| IV | 0 |
| Diagnosis n (%) | |
| Idiopathic PAH | 65 (68.4) |
| PAH and connective tissue disease | 21 (22.1) |
| Other | 9 (9.5) |
| mPAP mmHg | 45.7±16.4 |
| PVR Wood units | 8.4±5.9 |
| PCWP mmHg | 12.0±5.1 |
| Cardiac index L·min−1·m−2 | 2.5±1.1 |
| 6-min walk distance m | 414±132 |
| LTOT % | 18.3 |
| Mortality n (%) | 27 (28.4) |
Data are presented as mean±sd unless otherwise stated. BMI: body mass index; WHO: World Health Organization; PAH: pulmonary arterial hypertension; mPAP: mean pulmonary artery pressure; PVR: pulmonary vascular resistance; PCWP: pulmonary capillary wedge pressure; LTOT: long-term oxygen therapy.