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PCI, percutaneous coronary intervention; ECG, electrocardiography; STEMI, ST elevation myocardial infarction
| Variable | Estimates | 95% CI | p value |
| Prior PCI | 23.9 | -6.8–54.7 | 0.13 |
| Prehospital ECG | 49.1 | -11.1–109.2 | 0.11 |
| Meets STEMI criteria | -62.4 | -95.5–-19.4 | <0.01 |
