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.