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.