2.5. Statistical analysis
hypotensive, hypotension
REGRESSION, EVENTS, HYPOTENSIVE
Per protocol analysis was performed for the primary outcome and other categorical variables using the chi-square test. As the number of intraoperative hypotensive events presented a non-normal distribution, they were compared using the Wilcoxon rank-sum test. Other continuous variables were compared using t-tests. Statistical significance was set at Binomial logistic regression analysis for intraoperative hypotension was performed to compare the risk of hypotension with that of hypnotic drugs and adjust for the effects of covariates. The covariates included in the analysis were surgical type and American Society of Anesthesiologist physical status classification.