Summary of baseline characteristics
| All n (%) 691 | Had AMI n (%) 87 (12.6) | Did not have AMI n (%) 604 (87.4) | Missing n (%) | |
| Age, mean (SD) | 63.68 (15.3) | 68.11 (13.8) | 63.04 (15.4) | 0 |
| Male sex, n (%) | 398 (57.6) | 59 (67.8) | 339 (56.1) | 0 |
| Female sex, n (%) | 293 (42.4) | 28 (32.3) | 265 (43.9) | 0 |
| Hypertension, n (%) | 360 (52.2) | 56 (64.4) | 304 (50.4) | 1 (.1) |
| Hyperlipidaemia, n (%) | 162 (23.5) | 22 (25.3) | 140 (23.2) | 1 (.1) |
| Diabetes, n (%) | 141 (20.4) | 25 (28.7) | 116 (19.2) | 1 (.1) |
| Previous CVA or TIA, n (%) | 64 (9.3) | 13 (14.9) | 51 (8.5) | 2 (.3) |
| Peripheral vascular disease, n (%) | 28 (4.1) | 7 (8.0) | 21 (3.5) | 2 (.3) |
| Prior PCI or CABG, n (%) | 163 (23.6) | 34 (39.1) | 129 (21.4) | 1 (.1) |
| Previous AMI, n (%) | 194 (28.1) | 40 (46.0) | 154 (25.5) | 0 (.0) |
| Heart failure, n (%) | 47 (6.8) | 7 (8.0) | 40 (6.7) | 3(.4) |
| Pre-hospital ECG normal, n (%)* | 372 (54.1) | 25 (28.7) | 347 (57.8) | 4 (.6) |
| Pre-hospital ECG shows LBBB, n (%)* | 23 (3.4) | 5 (5.7) | 18 (3.0) | 10 (1.4) |
| Pre-hospital ECG shows ST depression, n (%)* | 87 (12.8) | 29 (33.3) | 58 (9.8) | 10 (1.4) |
| Pre-hospital ECG shows abnormal T inversion, n (%)* | 102 (15) | 24 (27.6) | 78 (13.1) | 10 (1.4) |
*ECG interpretation by the treating paramedic.
AMI, acute myocardial infarction; CABG, coronary artery bypass graft; CVA, cerebral vascular accident; LBBB, left bundle branch block; PCI, Percutaneous coronary intervention; TIA, transient ischaemic attack.