2.3. Statistical Analysis
POLAND
Statistica 13 software (Statsoft, Poland) was used for statistical analysis. The Shapiro–Wilk test was used to test the normality of data. The statistics is presented as mean, standard deviation (SD), and 95% confidence intervals (CI). The Mann–Whitney U test was used to compare two unmatched groups. The Wilcoxon test was used to compare two matched groups of data. Statistical significance level was 