STATISTICAL ANALYSIS
The study data were evaluated using SPSS 21.0 statistical software. Normality distribution of continuous variables was investigated using visual (histogram and probability charts) and analytical methods (Kolmogorov-Smirnov/Shapiro-Wilk tests). The descriptive statistics of the study were presented as mean and standard deviation for normally distributed data and as median, minimum and maximum for non-normally distributed data. The Chi-square test was used to show whether there was a difference between categorical variables. The Student’s t-test was used to compare the continuous variables with parametric properties in independent groups, while the Mann-Whitney U test was used to compare continuous variables with non-parametric properties in independent groups. The level of statistical significance was set at a p-value less than 0.05.