Statistical Analyses
Statistical analysis was performed using the SPSS software version 20.0 (IBM Corp., Armonk, New York, USA). Distribution of variables was evaluated for normality using the Kolmogorov–Smirnov and histogram tests. Descriptive data were expressed as mean ± standard deviation. Categorical variables were analyzed using the Chi-square test. Normally distributed data comprising continuous variables were analyzed using the Student’s t -test. The Mann–Whitney U test was used to analyze non-normally distributed data. p <0.05 was considered to be statistically significant.