Actual mortality according to preoperative assessment of risk of death
| Risk | Consultant | Senior trainee | Intermediate trainee | Total |
| Low (0–4%) | 5/610 (0.8%) | 2/347 (0.6%) | 3/188 (1.6%) | 10/1152 (0.9%) |
| Fair (5–9%) | 12/393 (3.1%) | 4/182 (2.2%) | 3/125 (2.4%) | 19/710 (2.7%) |
| Poor (10–14%) | 11/273 (4.0%) | 2/126 (1.6%) | 3/64 (4.7%) | 17/468 (3.6%) |
| High (15–19%) | 15/153 (9.8%) | 3/64 (4.7%) | 1/46 (2.2%) | 19/263 (7.2%) |
| Extremely high (> 20%) | 5/73 (6.8%) | 4/30 (13.3%) | 0/9 (0.0%) | 9/113 (8.0%) |
Values are number of deaths/total number of cases and (% mortality). All values are non-significant vconsultant.