Abbreviations: ARI: acute respiratory illness; RRR: relative risk ratio; OR: odds ratio; CI: confidence interval.
a Calculated using a multinomial logistic regression equation to control for patient-level covariates [including: number of complex chronic conditions, ventilator use, race, ethnicity, insurance type], culture-level covariates [including: age at culture acquisition, time with tracheostomy at culture acquisition, culture source (tracheostomy aspirate or bronchoalveolar lavage), department obtained], and to account for within-patient clustering and, for polymicrobial cultures, within-culture clustering.
b Other organism category includesAchromobacter, Chryseobacterium, Citrobacter, Elizabethkingia, Enterococcus, Delftia, Flavobacterium, Neisseria, Nocardia, Pantoea, Proteus, and Raoultella species, and Streptococcus dysgalactiae.