Patient characteristics at symptom (n=8913)
| Variable | Level | N (%) |
| Sex | Male | 4586 (51.5) |
| Female | 4327 (48.5) | |
| Age group (years) | <45 | 155 (1.7) |
| 45–64 | 1402 (15.7) | |
| 65–74 | 2413 (27.1) | |
| 75–84 | 3455 (38.8) | |
| 85+ | 1488 (16.7) | |
| IMD quintile | 1 (least deprived) | 1854 (20.8) |
| 2 | 2144 (24.1) | |
| 3 (average) | 1860 (20.9) | |
| 4 | 1643 (18.4) | |
| 5 (most deprived) | 1412 (15.8) | |
| Diagnosis source | Primary care | 2979 (33.4) |
| Hospital | 5934 (66.6) | |
| Comorbidity count | 0 | 1464 (16.4) |
| 1 | 2215 (24.9) | |
| 2 | 2185 (24.5) | |
| 3 | 1580 (17.7) | |
| 4+ | 1469 (16.5) | |
| History of comorbidity | Atrial fibrillation | 1917 (21.5) |
| Other arrhythmias | 1018 (11.4) | |
| Myocardial infarction | 484 (5.4) | |
| Coronary artery disease | 2274 (25.5) | |
| Myocarditis | 61 (0.7) | |
| Hypertension | 5235 (58.7) | |
| Stroke | 485 (5.4) | |
| Diabetes | 1773 (19.9) | |
| Congenital heart disease | 56 (0.6) | |
| Chronic pulmonary disease | 2034 (22.8) | |
| Peripheral vascular disease | 678 (7.6) | |
| Renal disease | 2010 (22.6) | |
| Symptom type | Breathlessness only | 6176 (69.3) |
| Ankle swelling only | 1202 (13.5) | |
| Fatigue only | 1412 (15.8) | |
| Two or more symptoms | 123 (1.4) |
IMD, Index of Multiple Deprivation.