| Subjects | 30 |
| Females/males | 18/12 |
| Age years | 56.3±38 (26–80) |
| Aetiology of PH | |
| Group 1: PAH | |
| Idiopathic | 12 |
| Connective tissue disease | 7 |
| Congenital heart disease | 5 |
| Heritable | 1 |
| Portal hypertension | 1 |
| Drugs/toxins | 1 |
| Group 3: owing to respiratory disease in PH lung | 1 |
| Group 4: CTEPH | 2 |
| Time since PAH diagnosis years | |
| <1 | 2 |
| 1 to <3 | 2 |
| 3 to <5 | 7 |
| 5 to <10 | 12 |
| >10 | 7 |
| WHO functional class | |
| I | 0 |
| II | 9 |
| III | 19 |
| IV | 2 |
Data are presented as n or mean±sd (range). PH: pulmonary hypertension; PAH: pulmonary arterial hypertension; CTEPH: chronic thromboembolic PH; WHO: World Health Organization.