Sample size and statistical analysis
SD
Based on our previous clinical data, the average duration of PACU stay in patients undergoing microlaryngeal vocal cord polypectomy was about 30 min. The sample size of this trial was calculated based on the assumption that the difference in duration of PACU stay between the THRIVE + LM group and MV + ETT group was more than 10 min. Finally, at least 38 patients (19 in each group) were needed to verify the difference between the two groups, with α = 0.05, power = 0.80, and a drop-out rate of 10%.Normality for continuous variables was determined using the Shapiro–Wilk test. Normal variables were presented as mean ± SD, and non-normal ones were presented as median (Interquartile Range, IQR). Student’s t-test or Mann–Whitney U test was selected to compare continuous variables, depending on the normality. χ