Statistics
The data were analyzed by using the SPSS 21.0 (IBM, USA) statistical package program. Descriptive statistics for numerical variables were given as mean, standard deviation or, median and minimum and maximum. Descriptive statistics for categorical variables were given as numbers and percentages. Shapiro-Wilk test was used to determine the normal distribution of the groups. For normal distribution data, differences between more than two groups were compared with ANOVA test. For abnormally distributed data, differences between more than two groups were compared with Kruskal-Wallis test. The comparison of parameters before and after dialysis was performed with the paired sample t-test in the normal distribution data and Wilcoxon signed rank questionnaire in abnormally distributed data. Pearson correlation test was used for correlation analysis. Statistical significance level was accepted as p <0.05.