Sample size
hypotension
PASS software (version 15, NCSS) was used to calculate the sample size. According to our preliminary findings, the incidence of hypotension after anesthesia induction was 0.633 and 0.367 in the propofol and remimazolam groups, respectively. We defined α as 0.05 and β as 0.2 and supposed that the rate of loss to follow-up was 10%. A sample size of 58 patients was required for each group. We finally included 120 patients for analysis in this study.