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.