Effect of case mix on hospital fatality
| Case mix variable | Hospital fatality (%) |
| Age and sex | |
| < 55 years | |
| Male | 11/325 (3%) |
| Female | 6/41 (14%)4-160 |
| Male and female | 17/366 (5%) |
| 55–64 years | |
| Male | 28/402 (7%) |
| Female | 10/120 (8%) |
| Male and female | 38/522 (7%) |
| 65–74 years | |
| Male | 77/570 (14%) |
| Female | 70/304 (23%)4-165 |
| Male and female | 147/874 (17%) |
| Left ventricular failure | |
| Yes | 142/387 (37%) |
| No | 56/1367 (4%)4-165 |
| Out of hospital resuscitation | |
| Yes | 37/78 (47%) |
| No | 165/1681 (10%)4-165 |