2.16. Statistical Analysis
The normality of distribution of variables in groups was checked using the Shapiro–Wilk test. Non-parametric tests were used to analyse differences between the examined variables. The Kruskal–Wallis rank ANOVA test was used to evaluate the significance of differences in the dependent variables. Dunn’s test was used for post hoc evaluation. The Mann–Whitney U test was applied for inter-group comparisons. Differences were considered statistically significant if the test probability was lower than the assumed level of significance (