Statistical analysis
Statistical analysis was performed using Pearson’s chi-square test and
Fisher’s exact test for categorical data and the Wilcoxon rank sum test
for continuous data. Neonatal outcomes were analyzed using the
generalized estimating equation method, considering twins and triplets
born to the same mother. A multiple logistic regression analysis was
performed to identify the independent risk factors for ESBL-E vaginal
colonization. The adjustment factors were selected backward for
variables with P -values of <0.05 in the univariate
analysis, and a multivariate analysis was performed after confirmation
that these adjustment factors had no collinearity in the covariate
analysis. Statistical significance was set at P -values of
<0.05. Statistical analysis was performed using SAS version
9.4 (SAS Institute, Cary, NC) and R version 4.0.4 (Vienna, Austria;
http://www.R-project.org/).