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Validation of the Simplified Psoriasis Index in Dutch children and adolescents with plaque psoriasis
Author(s) -
Geel M.J.,
Otero M.E.,
Jong E.M.G.J.,
Kerkhof P.C.M.,
Seyger M.M.B.
Publication year - 2017
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/bjd.15120
Subject(s) - psoriasis , plaque psoriasis , medicine , psoriasis area and severity index , dermatology , index (typography) , computer science , world wide web
Summary Background The Simplified Psoriasis Index ( SPI ) is a three‐domain assessment measure for psoriasis, including separate indicators of current severity ( SPI ‐s), psychosocial impact ( SPI ‐p), and past history and interventions ( SPI ‐i). There are two complementary versions available designed for completion by a health professional (pro SPI ) or by patient self‐assessment (sa SPI ). The validity and reliability of the pro SPI vs. sa SPI have already been demonstrated in adults. To date, validated severity measures for paediatric psoriasis do not exist. Objectives To validate the current severity ( SPI ‐s) and psychosocial impact ( SPI ‐p) domains of the pro SPI and sa SPI in children and adolescents with psoriasis. Methods All patients aged < 18 years with plaque psoriasis visiting the dermatology outpatient department of Radboud University Medical Center, the Netherlands, between September 2013 and April 2014 were asked to complete Dutch versions of the sa SPI and the Children's Dermatology Life Quality Index ( CDLQI ). The original English versions of the pro SPI and Psoriasis Area and Severity Index ( PASI ) were completed by the physician at the same visit. Results In total, 113 patients (median age 12·0 years, range 4–17) were included. There was a close correlation between the pro SPI ‐s and PASI ( r = 0·87), which was higher than between the sa SPI ‐s and PASI ( r = 0·69). The correlation between the SPI ‐p and CDLQI was 0·78. The full range of scores was utilized in both pro SPI ‐s and SPI ‐p, although the highest sa SPI ‐s score was 30 (maximum 50). Conclusions In paediatric psoriasis, the pro SPI and sa SPI are shown to be valid and usable. The SPI ‐s and SPI ‐p can be readily introduced into routine clinical practice.