Reliability, Responsiveness and Validity of Scalpdex in Children with Scalp Psoriasis: The Dutch Study
Annet M. Oostveen, Elke M.G.J. de Jong, Andrea W.M. Evers, A. Rogier T. Donders, Peter C.M. van de Kerkhof, Marieke M.B. Seyger
This aim of this study was to validate the Scalpdex, a quality of life questionnaire for adults with scalp dermatitis, in children with scalp psoriasis. The reliability, responsiveness and validity of the 3 scales (symptoms, functioning and emotions) of this 22-item questionnaire were analysed in a cohort of children with scalp psoriasis (age range 6–18 years). A total of 94 children completed the questionnaire once, and 53 children a second time, after treatment of their scalp psoriasis. The Children’s Scalpdex in Psoriasis (CSP) demonstrated reliability with internal consistency (Cronbach’s α, 0.69–0.91). The CSP scales proved sensitive to change in the expected direction for children whose scalp psoriasis improved. Moderate effect sizes were observed between both visits for all 3 scales of the CSP (Cohen’s d, 0.44–0.58). In conclusion, the CSP is a reliable, responsive and valid questionnaire, which is the first to illustrate the specific influence of scalp psoriasis on quality of life in children.