2.5. Statistical analyses
Statistical analyses were performed using the Statistica 6.1 software package (StatSoft® Inc., Tulsa, USA). Levels of AFM1 were expressed in the form of total mean ± SD, positive mean ± SD, range (min–max), percentages of samples in different ranges of AFM1 concentrations and as the total percentage of samples exceeding EU MRL. Differences in concentrations between two samples groups and the differences between seasons were assessed using the Mann–Whitney and Kruskal–Wallis tests, respectively. The confidence level required for significance was set at P ≤ 0.05.