Clostridium difficile Infection–Daily Symptoms (CDI-DaySyms™) questionnaire: psychometric characteristics and responder thresholds

Background The purpose of the current study was to determine the final content validation, psychometriccharacteristics, clinically meaningful improvement, and responder thresholds of the Clostridiumdifficile infection (CDI)–Daily Symptoms (CDI-DaySyms™) patient-reported outcome(PRO) questionnaire.