Overall occurrence of registered equipment-related incidents (by hospital location)
| Hospital location | A | B | Total |
| Performed surgery procedures during study | 861 | 719 | 1580 |
| Returned registration forms (percentage of total) | 459 (53.3%) | 474 (65.9%) | 933 (59.1%) |
| Registered incidents | 86 | 81 | 167 |
| Incidents excluded | 18 | 1 | 19 |
| Incidents included (percentage of total no of forms) | 68 (14.8%) | 80 (16.9%) | 148 (15.9%) |