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| Study name | Drain group | No‐drain group | Note |
| Álvarez 2005 | 1/29 | 0/31 | The cause of death was jejunal necrosis due to microembolisation of the mesenteric vessels |
| Jiang 2008 | 0/49 | 0/51 | ‐ |
| Kim 2004 S | 0/55 | 0/63 | ‐ |
| Kim 2004 T | 0/31 | 0/21 | ‐ |
| Kumar 2007 | 3/56 | 2/52 | P = 0.284, the cause of death was unclear |
