| Procedure | Group A (n = 24) | Group B (n = 26) | Group C (n = 23) | χ2 | MCp | |||
| No. | % | No. | % | No. | % | |||
| Elective | 17 | 73.9 | 23 | 88.5 | 18 | 80.0 | 1.753 | 0.434 |
| Primary | 7 | 26.1 | 3 | 11.5 | 5 | 20.0 | ||