Then, using a Shapiro-Wilk test (Shapiro and Wilk, 1965), we determined that none of the result distribution follow a normal distribution.
we used a non-parametric Wilcoxon/Mann-Whitney-U (Wilcoxon, 1945) (Mann and Whitney, 1947) test in order to check the pairwise significance (p < 0.01) of all pairs of result distributions.