Abbreviations: IQR: interquartile range; OR: operating room; WBCs: white blood cells.
a p-value was determined using Chi-square or Fisher’s exact tests for categorical variables and Wilcoxon rank sum tests for continuous variables.
b Excludes 264 cultures for which no BPD diagnosis information is available.
c Current or previous baseline ventilator use.
d Includes primary care and subspecialty clinics.
e Excludes 41 culture results without documentation of WBC count.