Statistical Analysis
Data analyses were examined by using Statistical Package for Social
Sciences (SPSS), Version 20.0 for Windows (SPSS Inc., Chicago, IL, USA).
The variables were investigated using visual (histograms, probability
plots) and analytical methods (Kolmogorov-Simirnov test) whether or not
they were normally distributed. Normally distributed variables were
presented using means and standard deviations, and non-normaly
distributed variables using median and range (maximum and minimum).
Comparisions of the groups were performed using the Student t (normally
distributed variables) and Mann-Whitney U (non normally distributed
variables). The chi-square test was used to analyze of categorical
variables. P values <0.05 were considered statistically
significant.