Statistical analysis
The SPSS statistical package (version 15.0; Chicago, IL) was used for
all data analysis. Descriptive findings for categorical variables were
reported as number and percentage; nominal variables were reported as
mean, standard deviation, minimum, maximum and median. When the nominal
variables did not achieve normal distribution, independent group
comparison was performed with Mann Whitney U test for 2 groups and with
Kruskal Wallis test for more than 2 groups. Dependent group analysis was
performed with Wilcoxon test. Spearman correlation analysis was used for
relations between nominal variables when parametric test condition was
not achieved. Relation formula is investigated with Linear Regression
Analysis. A P value of less than 0.05 was considered statistically
significant.