2.5. Statistical analysis
Since data obtained from the comet assay analysis is cat-egorical, a non-parametric statistical approach was chosen.The Kruskal–Wallis test was used to compare controls and contaminated treatments for each organ separately. Differenceswere analyzed by a post hoc Student–Newman–Keuls and statisticalsignificance was considered for p < 0.05.Oxidative stress biomarkers were tested for normal distributionusing the Kolmogorov–Smirnov test. Parametric one-way anal-ysis of variance (ANOVA) or the non-parametric Kruskal–Wallistest was applied according to data distribution (normality andhomogeneity of variance). Differences were analyzed by a post hocTukey test (after ANOVA) or Student–Newman–Keuls test (afterKruskal–Wallis). Statistical significance was considered for p < 0.05.3