Summary of associated factors cited
| Inadequate total experience | 77 |
| Inadequate familiarity with equipment/device | 45 |
| Poor communication with team, lab, etc | 27 |
| Haste | 26 |
| Inattention/carelessness | 26 |
| Fatigue | 24 |
| Excessive dependency on other personnel | 24 |
| Failure to perform a normal check | 22 |
| Training or experience—other factors | 22 |
| Supervisor not present enough | 18 |
| Environment or colleagues—other factors | 18 |
| Visual field restricted | 17 |
| Mental or physical—other factors | 16 |
| Inadequate familiarity with surgical procedure | 14 |
| Distraction | 13 |
| Poor labelling of controls, drugs, etc | 12 |
| Supervision—other factors | 12 |
| Situation precluded normal precautions | 10 |
| Inadequate familiarity with anesthetic technique | 10 |
| Teaching activity under way | 9 |
| Apprehension | 8 |
| Emergency case | 6 |
| Demanding or difficult case | 6 |
| Boredom | 5 |
| Nature of activity—other factors | 5 |
| Insufficient preparation | 3 |
| Slow procedure | 3 |
| Other | 3 |
| Total | 481 |