Statistical Analysis:
SPSS 22.0 for Mac (IBM SPSS Statistics) was used for statistical analysis. Continuous variables were reported as the mean +/− standard deviation or median (interquartile range) (IQR). Categorical variables were reported as the absolute frequency and as a percentage. Student’st -test was applied for continuous data with equal or unequal variances. The Mann-Whitney U test was applied for continuous data that were not normally distributed. Pearson’s \(\chi\)2 and Fisher’s exact tests were used for categorical data. All meaningful variables were included in a multiple logistic regression analysis. Logistic regression analysis was repeated using variables that were significant in the previous analysis 15. Accuracy was measured by the area under the receiver operating characteristic (ROC) curve analysis. p < 0.05 was considered to be statistically significant.