| Items | Breakdown | Cases (n = 197) | % |
| Medical treatment and care | Mistake of methods (technique) | 18 | 9.1 |
| Not implemented and forgetting | 13 | 6.6 | |
| Mistake of others in medical examination and treatment | 6 | 3.0 | |
| Accidental ingestion and pulmonary aspiration | 4 | 2.0 | |
| Mistake of site | 3 | 1.5 | |
| Vestigial remnant of foreign body in body | 3 | 1.5 | |
| Mistake of disinfecting and aseptic manipulation | 2 | 1.0 | |
| Implementation of unnecessary medical practice | 2 | 1.0 | |
| Mistake of medical supplies | 1 | 0.5 | |
| Mistake of date and time | 1 | 0.5 | |
| Cancellation and postponement | 1 | 0.5 | |
| Mistake of correct patient | 0 | 0.0 | |
| Out of sequence | 0 | 0.0 | |
| Others | 143 | 72.6 |