Sample size estimation and statistical analyses
Sample size was calculated using PASS 15 software. The primary outcome was the proportion of patients who required rescue analgesia in the first postoperative 12 h. We used the results of previous studies in which the proportion of patients who required rescue analgesia in TFP block was 15% (3/20) in TFP block and 12% (3/25) in QLB [Data analysis was done using IBM SPSS Statistics for Windows, Version 28.0 (IBM Corp., Armonk, NY, USA). At first, we used Shapiro–Wilk test to evaluate the normality of data distributions. Continuous variables data of normal distribution are expressed as mean ± SD (standard deviation) and variables data of abnormal distribution are expressed as median (interquartile ranges, Q1- Q3). The variables were compared using student’s t-test for data of normal distribution or Mann–Whitney U-for data of abnormal distribution. Categorical variables data are expressed as numbers (percentage) and the Pearson’s chi-square test or Fisher’s exact test was used for their comparison. The statistical significance was considered if P was < 0.05 at a confidence interval of 95%.