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Papers of the Week


2021 Mar 24


Br J Dermatol

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.

Abstract

The ItchyQoL is an itch-specific patient-reported outcome measure (PROM) assessing quality of life (QoL) in patients with chronic pruritus (CP). We aimed to assess and extend the psychometric properties of the ItchyQoL using classical test theory (CTT) and item response theory (IRT).