Publication: The simplified psoriasis index (SPI): A practical tool for assessing psoriasis
Issued Date
2013-01-01
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ISSN
15231747
0022202X
0022202X
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2-s2.0-84880324509
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Investigative Dermatology. Vol.133, No.8 (2013), 1956-1962
Suggested Citation
Leena Chularojanamontri, Christopher E.M. Griffiths, Robert J.G. Chalmers The simplified psoriasis index (SPI): A practical tool for assessing psoriasis. Journal of Investigative Dermatology. Vol.133, No.8 (2013), 1956-1962. doi:10.1038/jid.2013.138 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/31413
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Title
The simplified psoriasis index (SPI): A practical tool for assessing psoriasis
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Abstract
The Simplified Psoriasis Index (SPI) is a summary measure of psoriasis with separate components for current severity (SPI-s), psychosocial impact (SPI-p), and past history and interventions (SPI-i). It derives from the Salford Psoriasis Index but replaces Psoriasis Area and Severity Index (PASI) with a composite weighted severity score designed to reflect the impact of psoriasis affecting functionally or psychosocially important body sites. Two complementary versions are available, differing only in that current severity (SPI-s) is either professionally (proSPI-s) or patient self-assessed (saSPI-s). This study examined the criterion and construct validity and response distribution of proSPI-s, saSPI-s, and SPI-p in 100 patients with plaque psoriasis. A further 50 patients were assessed for test-retest reliability of these three components. Interrater reliability of proSPI-s was assessed in 12 patients, each assessed by 12 assessors (144 assessments). There was close correlation between PASI and proSPI-s (r=0.91); SPI-p was closely correlated with the Dermatology Life Quality Index (r=0.89). Strong intrarater (proSPI-s, saSPI-s, SPI-p, and SPI-i) and interrater (proSPI-s) reliability was demonstrated (all intraclass correlation coefficients >0.75). There were wide response distributions for all three components. We believe that both professional (proSPI) and self-assessed (saSPI) versions can readily be introduced into routine clinical practice. © 2013 The Society for Investigative Dermatology.