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Antibiotics administered 3 months before and after antibiotic allergy testing, expressed as a proportion of total antibiotic courses in each period. Abbreviations: NS, narrow spectrum; βL/βLIs, β-lactam/β-lactamase inhibitor; gen., generation; pre, pre–antibiotic allergy testing (3 months prior); post, post–antibiotic allergy testing (3 months after). *P ≤ .05; **P ≤ .01; ***P ≤ .001; ****P ≤ .0001.
