Statistical Analysis
All analyses were performed using Statistical Packages for Social
Sciences for Windows, Version 20.0 (SPSS Inc., NY, USA). The data were
expressed as means with standard deviations. Comparisons of the groups
for normally distributed variables were performed using an independent
samples t test. Differences between groups without normal distribution
were checked with Mann-Whitney U test, while groups with categorical
variables were compared with Pearson chi-square test. Significance was
evaluated at p value <0.05 for all tests.