| Admission department | No of reviewed admissions(N = 7926) | Incidence of AEs (%)* | Preventable AEs (%)* |
| Surgical | |||
| Neurosurgery | 116 | 9.5 | 15.4 |
| Urology | 221 | 7.8 | 32.0 |
| Surgery | 1443 | 7.7 | 40.1 |
| Ophthalmology | 51 | 5.8 | 40.0 |
| Ear, nose and throat | 198 | 5.2 | 22.2 |
| Orthopaedics | 496 | 5.1 | 52.4 |
| Gynaecology | 135 | 4.7 | 50.0 |
| Total | 2660 | 6.8 (95% CI 5.7 to 7.8) | 39.5 |
| Non-surgical | |||
| Intensive care | 373 | 9.4 | 50.0 |
| Internal medicine | 1950 | 5.4 | 25.7 |
| Cardiology | 1165 | 4.9 | 32.7 |
| Lung diseases | 787 | 5.4 | 71.0 |
| Neurology | 767 | 3.6 | 61.9 |
| Paediatrics | 142 | 1.6 | 50.0 |
| Other medical | 82 | NA | NA |
| Total | 5266 | 4.8 (95% CI 4.1 to 5.7) | 40.3 |
NA, not applicable
*Percentages were weighted for oversampling of deceased patients and of patients admitted to a university hospital.