| Years of Service | Number of Responders | Affirmed Vaccinated (%) | Affirmed Needle Injury (%) |
| ≤1 | 48 | 10 (20.8) | 13 (27.1) |
| 2 - 5 | 101 | 42 (41.6) | 29 (28.7) |
| 6 - 10 | 44 | 20 (45.5) | 24 (54.5) |
| ≥11 | 62 | 23 (37.1) | 32 (51.6) |
| Total | 255 | 95 (37.1) | 98 (38.4) |
| χ2 |
| 7.613 | 16.025 |
| df |
| 3 | 3 |
| P value |
| 0.055 | 0.001** |