Table 6.

Multivariate analysis of factors affecting the first exhaust time

Index	OR	95%CI	P value
BMI, kg/m2, < 24 or ≥ 24	1.060	0.649-1.733	0.081
Operation time, min, < 180 or ≥ 180	1.519	0.578-3.990	0.396
Early oral feeding, yes or no	2.689	1.289-3.783	< 0.001
Postoperative serum gastrin, ng/L, < mean or ≥ mean	0.476	0.195-1.162	0.103

OR: Odds ratio; CI: Confidence interval; BMI: Body mass index.