A Rasch model analysis of two interpretations of 'not relevant' responses on the Dermatology Life Quality Index (DLQI).
Fanni RenczAriel Zoltán MitevÁkos SzabóZsuzsanna BeretzkyAdrienn Katalin PoórPéter HollóNorbert M WikonkálMiklós SárdySarolta KárpátiAndrea SzegediÉva RemenyikValentin BrodszkyPublished in: Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation (2021)
Missing-scoring NRRs resulted in an improved measurement performance of the scale. DLQI scores of patients with at least one vs. no NRRs cannot be directly compared. Our findings provide further empirical support to the DLQI-R scoring modification that treats NRRs as missing and replaces them with the average score of the relevant items.