Objectives A number of bolt-ons have been proposed for the EQ-5D, including two psoriasis-specifc bolt-ons, skin irritation and self-confdence. The study investigates and compares the relevance and comprehensiveness of these psoriasis-specifc bolt-ons and the EQ-5D-5L and explores the potential...

Background: The EuroQol Valuation Technology (EQ-VT) protocol is currently employed by the valuation studies of the EQ family of instruments worldwide. To date, all the evidence in support of the quality control (QC) originates from quantitative indicators. Objective: We aimed to explore...