| Positivity | Random peritoneal biopsy | Total peritoneal gutter removal | χ2 | McNp | ||
| No. | % | No. | % | |||
| Negative | 124 | 95.4 | 111 | 85.4 | 7.479 | 0.004 |
| Positive | 6 | 4.6 | 19 | 14.6 | ||