| Classification | No of AEs | Distribution of AEs(column %*) | Preventable(row %*) | Permanent disability(row %*) | Deaths(row %*) |
| Surgery (events related to an operation or occurring within 30 days after an operation) | 297 | 54.2 | 34.4 | 4.0 | 5.1 |
| Drug/fluid (eg, side effects, allergic reactions, anaphylaxis) | 157 | 15.3 | 31.2 | 2.6 | 10.5 |
| Medical procedure (eg, central catheters, endoscopies, pacemakers, intervention radiology) | 135 | 17.0 | 27.9 | 9.3 | 7.0 |
| Diagnostic (eg, missed, delayed or inappropriate diagnostic process) | 80 | 6.3 | 84.4 | 12.9 | 22.6 |
| Other clinical management (including nursing care and allied healthcare) | 56 | 3.7 | 78.9 | 0 | 15.8 |
| Discharge (eg, inappropriate discharge) | 4 | 1.4 | 100.0 | 0 | 0 |
| Other (eg, fall) | 15 | 2.1 | 81.8 | 0 | 9.1 |
| Total | 744 | 100.0 | 39.6 | 5.0 | 7.8 |
*Percentages were weighted for oversampling of deceased patients and of patients admitted to a university hospital.