Statistical analysis
Descriptive statistics were used to describe the study population. All
parameters were described as mean and standard deviation (StDev). The
Kolmogorov–Smirnov test was applied to express normality, while
Spearman’s Correlation Coefficients were used to assess possible
correlations between the above parameters. The level of significance was
set to p < 0.05. Statistical analysis was performed using SPSS
for Windows version 20.0 (SPSS Statistics 20, IBM Hellas Inc.).