Table 2.

Multivariate logistic regression analysis with factors associated with PONV in observational cohort study

Variables	OR (odds ratio)	95% CI	P-value
Sex (male vs female)	0.306	0.253 ~ 0.369	<  0.001
Inhaled anesthesia	4.020	3.189 ~ 5.067	<  0.001
Postoperative opioid (patient-controlled analgesia)	0.326	0.245 ~ 0.433	<  0.001
Vagus nerve trunk resection	0.302	0.237 ~ 0.386	<  0.001

CI Confidence interval