“…Another common approach has been to measure individual components of appropriateness, which can be objectively defined and quantified. Mean duration of treatment is among the most commonly studied [6, 8, 19, 47•, 48, 49, 75, 78], along with related measures such as percentage of courses exceeding a pre-defined duration [36], excess antibiotic days [14,19] or antibiotic-free days [48]. Appropriateness of antimicrobial spectrum has been operationalized as frequency of inadequate coverage [13] or redundant coverage [13,19]; appropriateness of antibiotic reassessment has been captured in rates of streamlining broad-spectrum coverage when microbiology results are avail- [19, 26, 34, 47•], converting from intravenous to oral route of administration [7, 47•] and switching classes of agents [12,24].…”