Development of MCIH in open group
| Characteristics | Patients | Development of MCIH within 2 year | Development of MCIH total | Incidence of total MCIH (%) | P value |
| Gender | |||||
| Male | 146 | 11 | 11 | 7.5 | 0.028 |
| Female | 64 | 8 | 12 | 18.8 | |
| Initial side | |||||
| Right | 104 | 6 | 6 | 5.8 | 0.007 |
| Left | 89 | 13 | 17 | 19.1 |
MCIH, metachronous contralateral inguinal hernia.