2.7. Statistical Analysis
The SPSS 22.0 program was used for analysis. We used the mean, standard deviation, median, minimum, maximum, frequency, and ratio values for descriptive statistics. The distribution of variables was measured with the Kolmogorov–Smirnov test. As we had a small sample size, it was important to determine the distribution of the variable in order to choose an appropriate statistical method, so the Shapiro–Wilk test was performed and showed non-normality, and the results were consistent with the Kolmogorov–Smirnov test. The Kruskal–Wallis and the Mann–Whitney tests were used in the analysis of quantitative independent data. Dependent quantitative data were analyzed with the Wilcoxon test. Quantitative independent data were analyzed using the chi-square test, but when the conditions for the chi-square test were not met, we used the Fisher test. For the analysis of repeated data, the repeated measures ANOVA was used. The calculation of the sample size was based on a previous study [