Statistical analysis
The analysis was performed using the SPSS 20.0 program. Normality was assessed using the Shapiro-Wilks test. The variables were expressed as means and standard deviations. Chi-square was used to compare categorical variables. To compare values between groups, the independent Student’s T test was used and the intra-group comparison was the paired Student’s T test. It was considered as significant when p <0.05. The delta value (∆) was found by subtracting the preoperative value from the value found on the day of discharge.