CDI Risk Associated with Antimicrobial Exposures During and Within 5 days of the End of Antimicrobial Therapy, for Antibiotic Risk Indexes and Specific Antibiotic Exposures.

Abbreviations: AIC, Akaike's Information Criterion; CDI, Clostridium difficile infection; CI, confidence interval; d, days; IR, incidence rate; IRR, incidence rate ratio.aIncidence rate, per 10,000 patient-days.bThe difference in AIC relative to the reference model (receipt of any antibiotic in the previous 5 days): negative numbers denote an improvement in fit. Δ AIC cAdjusted for time since hospital admission, age, sex, number of previous hospital admissions, infection pressure, and current or prior ICU admission.dEach antibiotic group was assessed in a separate model; the reference group for each model was no receipt of antibiotics in the last 5 days.CDI Risk Associated with Antimicrobial Exposures During and Within 5 days of the End of Antimicrobial Therapy, for Antibiotic Risk Indexes and Specific Antibiotic Exposures.