Statistical analysis
Data analysis was performed using the software SPSS (Statistical Package for the Social Sciences) version 26. Categorical variables were compared using the chi-square test, Fisher’s exact test and Monte Carlo test when appropriate. To compare ordinal data between groups, the Chi-square test for trend was used, and Kolmogorov–Smirnov (distribution-type) and Levene (homogeneity of variances) tests were used to verify assumptions for use in parametric tests. To compare quantitative data between more than two groups, one-way ANOVA (for normally distributed data) and the Kruskal–Wallis test (for nonnormally distributed data) were used. When the difference was significant, pairwise comparisons and Tukey’s HSD comparisons were used to detect differences between two individual groups. The level of statistical significance was set at 