Symptoms and outcome
| Control | COPD | p-value | |
| Subjects n | 302 | 302 | |
| Typical chest pain | 115 (38.1) | 76 (25.2) | 0.0009 |
| Atypical chest pain | 43 (14.2) | 78 (25.8) | 0.0005 |
| Non-anginal chest pain | 63 (20.9) | 93 (30.8) | 0.0069 |
| Dyspnoea only | 81 (26.8) | 55 (18.2) | 0.015 |
| CCS | |||
| 0 | 81 (26.8) | 55 (18.2) | 0.015 |
| 1 | 56 (18.5) | 9 (3.0) | <0.0001 |
| 2 | 70 (23.2) | 67 (22.2) | 0.85 |
| 3 | 34 (11.3) | 81 (26.8) | <0.0001 |
| 4 | 61 (20.2) | 90 (29.8) | 0.0084 |
| NYHA | |||
| 1 | 129 (42.7) | 60 (19.9) | <0.0001 |
| 2 | 139 (46.0) | 93 (30.8) | 0.0002 |
| 3 | 28 (9.3) | 121 (40.1) | <0.0001 |
| 4 | 6 (2.0) | 28 (9.3) | <0.0001 |
| Delay between symptoms and ICA months | 8.3±12.7 | 19.9±22.0 | <0.0001 |
| ICA | |||
| Negative (no stenosis) | 128 (42.4) | 139 (46.0) | 0.41 |
| <50% stenosis | 14 (4.6) | 24 (8.0) | 0.13 |
| 50–70% stenosis | 36 (11.9) | 50 (16.6) | 0.13 |
| >70% stenosis | 113 (37.4) | 79 (26.2) | 0.0039 |
| 100% stenosis | 11 (3.6) | 10 (3.3) | 1.00 |
| Revascularisation (PCI, CABG) | 118 (39.1) | 94 (31.1) | 0.050 |
| Follow-up months | 38.4±39.5 | 38.4±39.0 | 0.94 |
| MACE | 4 (1.3) | 18 (6.0) | 0.004 |
| Cardiovascular death | 2 (0.7) | 11 (3.6) | 0.02 |
| All-cause death | 6 (2.0) | 16 (5.3) | 0.05 |
Data are presented as n (%) or mean±sd, unless otherwise stated. CCS: Canadian Cardiovascular Society grading scale; NYHA: New York Heart Association grading scale; ICA: invasive coronary angiography; PCI: percutaneous coronary intervention; CABG: coronary artery bypass graft; MACE: major adverse cardiovascular events. Bold text indicates statistical significance.