STATISTICAL ANALYSIS
Discrete data were expressed as numbers and percentages, while continuous variables were reported as mean and standard deviation when normally distributed, along with the median and minimum and maximum values. According to the suitability of the normal distribution of the data for the comparison of continuous variables, the t-test or Mann–Whitney U-test were used. To compare nominal data, the chi-square test or Fisher exact test were utilized. The Wilcoxon test served for the comparison of the MMSE and MoCA measurements before and after anesthesia in each anesthesia group. The analysis was performed with SPSS 11.5, and p < 0.05 was accepted as the statistical significance limit.