Table 3.
Univariate analysis of surgery-related factors
| Anastmotic Leakage | ||||
| Variables | negative | positive | P value | |
| operation methods | open | 84 | 8 | |
| laparoscopic | 66 | 3 | 0.279 | |
| Ligation of IMA | high ligation† | 128 | 8 | |
| low ligation‡ | 22 | 3 | 0.265 | |
| Lateral lymph node dissection | Yes | 29 | 3 | |
| No | 121 | 8 | 0.524 | |
| multiple firing§ | Yes | 6 | 3 | |
| No | 140 | 8 | 0.001 | |
| placement of transanal tube | Yes | 27 | 3 | |
| No | 123 | 8 | 0.446 | |
| diverting ileostomy | Yes | 34 | 3 | |
| No | 116 | 8 | 0.726 | |
| Diameter of circular stapler | ≦29 | 101 | 6 | |
| >29 | 43 | 5 | 0.281 | |
| Operating time | <300 | 97 | 6 | |
| ≧300 | 52 | 5 | 0.481 | |
| Intraoperative bleeding | <250 | 87 | 5 | |
| ≧250 | 44 | 6 | 0.001 | |
P value of < 0.05 was considered statistically significant.
IMA: inferior mesenteric artery
†: IMA was ligated at its root. ‡: IMA was ligated at superior rectal artery. (left colic artery was preserved.) §: multiple firings: number of linear stapler-curtilages used for rectal transaction is three and over.