| Longevity of service | Post-op care | Total | ||
| Yes | At times | No | ||
| 0 - 10 years | 19 | 5 | 7 | 31 |
| 11 - 20 years | 14 | 20 | 9 | 43 |
| 21 - 30 years | 6 | 6 | 14 | 26 |
| Total | 39 | 31 | 30 | 100 |