Statistical analysis
Continuous variables were presented as mean ±SD. Categorical variables
were presented as counts (percentages). After measuring each variable,
the accuracy and features of all of the pre-existing parameters were
calculated via receiver operating characteristic (ROC) curve analysis.
The optimal cutoff was selected based on the Youden index. Statistical
analysis was performed using SPSS 23.0. A two-tailed p-value of
<0.05 was considered statistically significant.