Statistical analysis
Statistical analysis was performed using the SPSS 25.0 software package (SPSS Inc., Chicago, IL), and statistical significance was assumed at p<0.05. All hypothesis tests were two-sided.
Values were expressed as mean ± standard deviation (SD) since data were normally distributed, and categorical variables were expressed as numbers and percentages. Univariable comparisons of categorical variables were performed using a chi‐squared test or Fisher’s exact test. Comparison of normally distributed continuous variables was performed using Student’s T-test, and non-normally distributed variables with the Mann-Whitney U-test. Binary logistic regression models were used to calculate odds ratios (OR) and 95% confidence intervals (CI).