2.5 | Statistics
Statistical analyses were performed with statistical software SPSS 15.0. Comparisons between two independent groups were made by Student’s t-test and by Mann Whitney U test.
More than two-group comparisons of numerical variables were made with One Way ANOVA when the normal distribution condition was met in the groups, and the Kruskal Wallis test when the normal distribution condition was not met. Subgroup analyzes were made with the Mann Whitney U test and interpreted with Bonferroni correction. In the dependent groups, the numerical variables were analyzed with Paired t-test in two dependent groups by repeated measurement variance analysis in more than two groups, since the differences provided the normal distribution condition. When the parametric test condition between numerical variables was met, it was examined with Spearman Correlation Analysis when it was not provided with Pearson Correlation Analysis. The statistical alpha (level of significance) level was accepted as p<0,05.