*3.8. Statistics*

Shapiro–Wilk test was used to evaluate the hypothesis that each data vector had a normal distribution. Comparison between two normally distributed samples was performed with two-tailed, non-paired Student's *t*-test. The analysis of variance (ANOVA), followed by multiple comparison test, was used to compare more than two normally distributed samples. Kruskal–Wallis test was used to compare not normally distributed samples. Statistical significance was set at 5%.
