| Group | N | Sex | Age at the time of surgery (years) | |
| Male | Female | |||
| A | 38 | 14 (36.8%) | 24 (63.2%) | 41.9 ± 15.8 |
| B | 17 | 8 (47.1%) | 9 (52.9%) | 43.5 ± 15.8 |
| P |
| 0.4748* | 0.7334** | |