Statistical analysis:
In this study, all information obtained was entered in to statistical
package for the social sciences, version 25.0, SPSS Inc, Chicago,
Illinois, USA (SPSS). Descriptive statistics were used to calculate the
frequency (n), percentage (%), central tendency (mean, median&mode)
and dispersion (range, variance, SD, maximum& minimum) for each
variable when appropriate. The consistency of the data with the normal
dispersion has been evaluated by the Kolmogorov-Smirnov test. Student-t
test, Mann Whitney- U test, One-way ANOVA test or Chi square test were
used when appropriate.