Statistical analysis
Data were presented as means±SD, No. (%), M (P25, P75). Continuous
variables were compared by using the t-test or Mann–Whitney U test.
Categorical variables were compared using the χ2 test. All statistical
analyses were done with the SPSS statistical software (version 26.0,
SPSS Corporation, Chicago). The significance threshold was set at
P<0.05. We used conditional logistic regression models to
compute odds ratios (OR) and 95% confidence intervals (CI).