Refinement and validation of the ItchyQoL using classical test theory and item response theory resulted in a reduction of the response categories from a 5‐point to a 3‐point scale
British Journal of Dermatology2021Vol. 185(3), pp. 548–554
Citations Over TimeTop 11% of 2021 papers
Abstract
We suggest a revision of the response categories of the ItchyQoL from a 5-point to a 3-point scale. When this revision was applied, the ItchyQoL showed excellent structural validity according to CTT and IRT/Rasch. The calculation of an overall ItchyQoL sum score is allowed.
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