highly significantp = 1.141E-08
A separate Kruskal-Wallis test for geographical regions also indicated a highly significant effect ( H = 36.56, p = 1.141E-08), with Dunn-corrected comparisons confirming that both the Silesian Upland and the South Greater Poland Lowland differed significantly from the Silesian Lowlands ( p < 0.001), whereas their mutual contrast remained non-significant.