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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.


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).