Table 5.
Risk of in-hospital mortality following a diagnosis of first acute myocardial infarction: a multivariable logistic regressiona
| Covariate | Odds ratio, 95 % CI | P value |
|---|---|---|
| Age categories (tertiles) | ||
| 18–58 years (reference) | 1.00 | |
| 59–74 years | 2.3 (1.3–4.3) | 0.006 |
| 75 year or more | 5.0 (2.8–9.1) | <0.001 |
| Female sex | 1.6 (1.1–2.3) | 0.007 |
| Socioeconomic statusb | ||
| Low tertile (reference) | 1.00 | |
| Middle tertile | 0.8 (0.5–1.3) | 0.4 |
| High tertile | 0.8 (0.6–1.2) | 0.3 |
| Born in Australia | 0.8 (0.6–1.1) | 0.2 |
| Chest pain as main presenting symptom | 0.3 (0.2–0.4) | <0.001 |
| Arrival in the ED within 60 min of onset of symptoms | 0.9 (0.6–1.6) | 0.9 |
| Arrival in ambulance | 3.9 (2.0–7.8) | <0.001 |
| Triage classification of urgency | ||
| Non-urgent presentations (reference) | 1.00 | |
| Emergency presentations/resuscitation needed | 3.0 (1.8–4.9) | <0.001 |
| Admitted to CCU or ICU | 0.5 (0.3–0.7) | <0.001 |
| Time from arrival in the ED to examination by physician (continuous variable) | 1.0 (0.9–1.0) | 0.9 |
Abbreviation: CCU coronary care unit, CI confidence interval, ED emergency department, ICU intensive care unit
aAlso adjusted for hour of presentation, hospital type, length of stay in the ED, and language spoken at home
bThe socioeconomic status was based on the Socio-Economic Index For Areas disadvantage score (SEIFA)