Results of logistic regression model with addition of treatment variables
| Patient characteristics | Odds ratio (95% CI) | p value |
| Non-metropolitanv Metropolitan3-150 | 1.09 (0.57, 2.07) | 0.790 |
| Transfer yesv no3-150 | 1.19 (0.64, 2.21) | 0.581 |
| Age group | ||
| ⩽60 | 0.11 (0.05, 0.25) | <0.001 |
| 61–70 | 0.14 (0.08, 0.25) | <0.001 |
| >70 | 1 | |
| Sex (male v female) | 0.52 (0.33, 0.82) | 0.006 |
| Pulse | ||
| <80 | 1 | |
| 80–<110 | 1.69 (0.95, 3.00) | 0.072 |
| ⩾110 | 0.87 (0.41, 1.82) | 0.697 |
| Systolic blood pressure | ||
| <100 | 1.98 (0.99, 3.93) | 0.052 |
| 100–180 | 1 | |
| >180 | 0.68 (0.34, 1.36) | 0.270 |
| Raised JVP | 1.62 (0.88, 2.98) | 0.120 |
| Lungs basal crepitations | 1.21 (0.81, 1.81) | 0.333 |
| Pulmonary oedema | 1.77 (1.13, 2.76) | 0.013 |
| Cardiac arrest | 4.46 (2.07, 9.57) | <0.001 |
| ST increase | ||
| Yes | 3.66 (2.07, 6.47) | <0.001 |
| No | 1 | |
| Not recorded | 5.12 (2.29, 11.44) | <0.001 |
| ST depression | ||
| Yes | 1.32 (0.73, 2.39) | 0.348 |
| No | 1 | |
| Not recorded | 1.48 (0.39, 5.60) | 0.555 |
| LBBB | ||
| Yes | 1.18 (0.57, 2.45) | 0.651 |
| No | 1 | |
| Not recorded | 0.99 (0.50, 1.97) | 0.972 |
| History | ||
| Previous AMI | 0.51 (0.26, 0.98) | 0.043 |
| Angina or revascularisation | 1.09 (0.65, 1.84) | 0.740 |
| No history | 1 | |
| Diabetes | 1.40 (0.78, 2.50) | 0.249 |
| Position | ||
| Anterior | 1 | |
| Inferior | 0.73 (0.36, 1.50) | 0.386 |
| Other | 1.47 (0.68, 3.16) | 0.318 |
| Not recorded | 1.44 (0.70, 2.98) | 0.317 |
| Cardiomegaly | 0.60 (0.37, 0.98) | 0.043 |
| Principal symptom precipitating admission | ||
| Chest painv other | 0.80 (0.43, 1.49) | 0.476 |
| Reinfarction | 5.16 (2.92, 9.10) | <0.001 |
| Recurrent chest pain | 0.98 (0.57, 1.71) | 0.954 |
| Insurance | ||
| Chargeable | 1 | |
| Veterans affairs non-chargeable | 2.17 (0.90, 5.27) | 0.085 |
| Non-chargeable | 2.79 (1.47, 5.30) | 0.002 |
| ACE inhibitor | 0.41 (0.25, 0.67) | 0.001 |
| β blocker | 0.29 (0.17, 0.50) | <0.001 |
| Aspirin | 0.20 (0.13, 0.32) | <0.001 |
| Intravenous heparin | 0.63 (0.34, 1.17) | 0.140 |
| Intravenous nitrates | 1.42 (0.86, 2.34) | 0.161 |
| Thrombolysis | 1.48 (0.72, 3.02) | 0.277 |
↵3-150 For non-transferred patients the odds ratio (95% CI) was 0.90 (0.48, 1.67) while for transferred patients it was 6.89 (1.01, 46.87).