2.10. Statistical Analysis
SPSS (version 28.0; IBM Corp., Armonk, NY, USA) was used for statistical analyses. The distribution of the data was assessed using the Shapiro–Wilk test, and we confirmed that the data followed a normal distribution. To verify the consistency of baseline values (i.e., values in the second postoperative week), the PRE values were tested between the FR and control groups using an unpaired 