Demographic characteristics of the sample by arrival time
| Variable | Early presenters (<2 h) (n=789) | Middle presenters (2–6 h) (n=764) | Late presenters (>6 h) (n=962) | p Value |
|---|---|---|---|---|
| Mean age, years (SD) | 56 (14) | 58 (15) | 59 (15) | <0.01 |
| Male sex | 480 (60.8) | 443 (58.0) | 576 (60.0) | 0.51 |
| Caucasian | 701 (91.5) | 649 (87.4) | 809 (86.2) | <0.01 |
| Index AMI or urgent revascularisation | 102 (12.9) | 122 (16.0) | 196 (20.4) | <0.01 |
| Endpoint after presentation (all patients) | 37 (4.7) | 57 (7.5) | 92 (9.6) | <0.01 |
| Endpoint after presentation for patients without index ACS (% of patients without index ACS) | 23 (3.4) | 35 (5.5) | 52 (6.8) | 0.36 |
| Endpoint after presentation for patients with index ACS (% of patients with index ACS) | 14 (13.7) | 22 (18.03) | 40 (20.4) | 0.01 |
| Risk factors | ||||
| Hypertension | 383 (48.5) | 373 (48.8) | 445 (46.3) | 0.49 |
| Dyslipidaemia | 374 (47.4) | 380 (49.7) | 443 (46.1) | 0.31 |
| Diabetes | 97 (12.3) | 110 (14.4) | 125 (13.0) | 0.46 |
| Family history of CAD | 380 (48.2) | 396 (51.8) | 488 (50.7) | 0.33 |
| Current or recent smoker | 165 (20.9) | 158 (20.7) | 224 (23.3) | 0.34 |
| Cardiovascular history | ||||
| Prior MI | 154 (19.5) | 177 (23.2) | 206 (21.4) | 0.21 |
| Prior Angina | 205 (26.0) | 265 (34.7) | 287 (29.8) | <0.01 |
| CAD | 141 (17.9) | 152 (19.9) | 167 (17.4) | 0.37 |
| Prior CABG | 44 (5.6) | 68 (8.9) | 75 (7.8) | 0.04 |
| Prior angioplasty | 117 (14.8) | 134 (17.5) | 157 (16.3) | 0.35 |
ACS, acute coronary syndrome; AMI, acute myocardial infarction; CABG, coronary artery bypass graft; CAD, coronary artery disease; MI, myocardial infarction.