Table 2 Regression coefficients of the time of first postoperative flatus model based on 7 independent variables

Age

1.00(1.00–1.00)

< 0.01

Oral laxatives for bowel preparation

0.01

 No

1.00

 Yes

0.60(0.40–0.90)

Oral antibiotics for bowel preparation

0.02

 No

1.00

 Yes

2.00(1.10–3.60)

Probiotics

0.02

 No

1.00

 Yes

0.02(0.75–0.95)

Postoperative fortified antibiotics

0.02

 No

1.00

 Yes

1.40(1.00–1.80)

Duration of operation(min)

1.00(1.00–1.00)

0.02

Time of postoperative feeding (day)

1.30(1.30–1.40)

< 0.01