Cato Mørk, Astrid Wahl, Torbjørn Moum
DOI: 10.1080/000155502320624078

The aim of this study was to test the Norwegian version of the Dermatology Life Quality Index (DLQI-N) for validity and reliability in psoriatic patients. The DLQI-N was administered to 230 patients with psoriasis who underwent climate therapy on Gran Canaria, with a dermatologist assessing their psoriasis severity using the Psoriasis Area and Severity Index. Factor analyses resulted in a unidimensional pattern, which supports the use of a total DLQI-N score. The internal consistency coefficient of this unidimensional measure was 0.90 (Cronbach's alpha) and the paired inter-item correlations ranged from 0.20 to 0.76 (p 0.01). Questions related to work, sport and sex were the issues most often ticked off as not relevant, and the item related to working/studying was often misunderstood. DLQI-N scores were significantly associated with disease severity, age and sex. We assess DLQI-N as a valid, reliable and clinically useful outcome measure for quality of life in Norwegian patients with psoriasis.