Baseline characteristics of patients with STEMI treated with PPCI
| Baseline characteristics | Total (n=1818) | Age <50 (n=465) | Age ≥50 (n=1353) | P value |
| Age, mean±SD (years) | 58.1±12.2 | 43.0±4.9 | 63.2±9.4 | <0.0001 |
| Gender: male | 1587 (87.3%) | 437 (94%) | 1150 (85%) | <0.0001 |
| Ethnicity | ||||
| Chinese | 948 (52.1%) | 160 (34.4%) | 788 (58.2%) | <0.0001 |
| Malay | 357 (19.6%) | 87 (18.7%) | 270 (20%) | <0.0001 |
| Indian | 369 (20.3%) | 149 (32%) | 220 (16.3%) | <0.0001 |
| Others | 144 (7.9%) | 69 (14.8%) | 75 (5.5%) | <0.0001 |
| Smoking status | ||||
| Non-smoker | 742 (40.8%) | 144 (31%) | 598 (44.2%) | <0.0001 |
| Current smoker | 861 (47.4%) | 284 (61.1%) | 577 (42.6%) | <0.0001 |
| Ex-smoker | 215 (11.8%) | 37 (8.0%) | 178 (13.2%) | <0.0001 |
| Risk factors | ||||
| Hypertension | 913 (50.2%) | 147 (31.6%) | 766 (56.6%) | <0.0001 |
| Diabetes mellitus | 630 (34.7%) | 131 (28.2%) | 499 (36.9%) | 0.001 |
| Dyslipidaemia | 922 (50.7%) | 178 (38.3%) | 744 (55%) | <0.0001 |
| Family history of IHD | 212 (11.7%) | 84 (18.1%) | 128 (9.5%) | <0.0001 |
| Past history | ||||
| Previous AMI | 227 (12.5%) | 35 (7.5%) | 192 (14.9%) | <0.0001 |
| Previous PCI | 239 (13.1%) | 35 (7.5%) | 204 (15.1%) | <0.0001 |
| Previous CABG | 26 (1.4%) | 0 (0%) | 26 (1.9%) | 0.003 |
| Stroke | 76 (4.2%) | 6 (1.3%) | 70 (5.2%) | <0.0001 |
| Chronic kidney disease | 103 (5.7%) | 7 (1.5%) | 96 (7.1%) | <0.0001 |
| Atrial fibrillation | 34 (1.9%) | 1 (0.2%) | 33 (2.4%) | 0.002 |
AMI, acute myocardial infarction; CABG, coronary artery bypass graft surgery; IHD, ischaemic heart disease; PCI, percutaneous coronary intervention; PPCI, primary percutaneous coronary intervention; STEMI, ST segment elevation myocardial infarction.