Statistical analysis
Statistical Package for Social Sciences version 22.0 (IBM Corp.; Armonk,
NY, USA) was used for all statistical analyses. Variables were reflected
as the mean ± standard deviation and frequency values. The Levene test
was performed for the homogeneity of variances. The assumption of
normality was done with the Shapiro-Wilk test. Student’s t-test was used
for continuous variables if the parametric test meets the prerequisites,
otherwise, Mann Whitney-U test was performed. Categorical variables were
compared by Chi-square test or Fisher’s exact test. p<0.05 was
considered as statistically significant.