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Analyzing the 22‐item Sino‐Nasal Outcome Test using item response theory

The 22‐item Sino‐Nasal Outcome Test (SNOT‐22) is a widely applied patient‐reported outcome instrument used to assess the severity of symptoms associated with chronic rhinosinusitis. The purpose of this study was to evaluate the measurement performance of the SNOT‐22 instrument on an item‐level basis, in a sample of patients awaiting elective surgery for chronic rhinosinusitis.