Statistical Methods
The statistical analyses were performed using R version 4.0.2
(2020-06-22, The R Foundation for Statistical Computing,
https://www.R-project.org). Data are presented as medians, interquartile
ranges (IQRs), and ranges, as the continuous variables were not normally
distributed. Wilcoxon test was used to assess differences in continuous
variables. For determining the risk effect of different exposures
conditional logistic regression models were applied. The results are
presented as odds ratios (OR) and 95% confidence intervals (CI).P value was considered significant when < 0.05.