Statistical analysis
postoperative vomiting, vomiting
Based on the incidence of postoperative vomiting in our pilot study, the proportions of patients who experienced vomiting within 24 h after surgery in the control group and anisodamine group were 80% and 40% respectively (Table S1). The sample size was calculated to be 84 patients (28 in control and 56 in anisodamine), with a significance level of 5% in the two-sided test and a detection power of 95% which allowing for 15% loss to follow-up.Continuous variables were presented as mean ± standard deviation (SD) if normally distributed or median (interquartile ranges, IQR) if not. The assumption of data normality was confirmed using a Shapiro-Wilk test. The comparisons between groups were conducted with 