Table 2 shows that P scores don’t differ by gender (t =.557, p >.05). P scores are analyzed according to mothers and father’s education level, and Kruskal Wallis test is utilized for this purpose. The reason of choosing the Kruskal Wallis test is non-normal distribution of data. The Mann Whitney U test is used for comparisons of each two subgroups. The results of this comparison are given in Table 3 below.