Patient disposition to intervention and diagnostic imaging by region (see also supplementary figure S2)
| Europe | Japan | AAO | Total | |
| Subjects n | 779 | 115 | 116 | 1010 |
| Candidates to intervention | ||||
| PEA operable | 562 (72.1) | 27 (23.5) | 80 (69.0) | 669 (66.2) |
| BPA, not operable | 107 (13.7) | 79 (68.7) | 7 (6.0) | 193 (19.1) |
| Neither | 110 (14.1) | 9 (7.8) | 29 (25.0) | 148 (14.7) |
| VQ scan | 512 (65.7) | 114 (99.1) | 114 (98.3) | 740 (73.3) |
| PA | 754 (96.8) | 114 (99.1) | 112 (96.6) | 980 (97.0) |
| Number of pulmonary angiograms performed n | 1156 | 174 | 121 | 1451 |
| Conventional PA | 459 (39.7) | 112 (64.4) | 60 (49.6) | 631 (43.5) |
| CT PA | 595 (51.5) | 62 (35.6) | 61 (50.4) | 718 (49.5) |
| MR PA | 102 (8.8) | 0 (0.0) | 0 (0.0) | 102 (7.0) |
Values are expressed as n (%) unless otherwise indicated. AAO: America and others; PEA: pulmonary endarterectomy; BPA: balloon pulmonary angioplasty; VQ: ventilation/perfusion; PA: pulmonary angiogram; CT: computed tomography; MR: magnetic resonance.