2.2. Sample Size and Statistical Analysis
A difference of 10 points in the QoR-40K score is associated with a 15% improvement in the quality of recovery [Data were analyzed using SPSS 23.0 (IBM Corp., Armonk, NY). The Kolmogorov–Smirnov test was performed to examine the normality of the data. Continuous variables with a normal distribution were compared using the two-sample independent t test, and continuous variables that were not normally distributed were compared using the Mann–Whitney test. Categorical data were compared using Fisher’s exact test. In all analyses, 