Publication: Assessing the validity and response distribution of the simplified psoriasis index in patients receiving phototherapy
Issued Date
2018-02-01
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ISSN
14400960
00048380
00048380
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2-s2.0-84991245404
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Mahidol University
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SCOPUS
Bibliographic Citation
Australasian Journal of Dermatology. Vol.59, No.1 (2018), 41-47
Suggested Citation
Nekma Meah, Ali Alsharqi, Richard M. Azurdia, Lynne Catherine Owens, Richard Parslew, Leena Chularojanamontri Assessing the validity and response distribution of the simplified psoriasis index in patients receiving phototherapy. Australasian Journal of Dermatology. Vol.59, No.1 (2018), 41-47. doi:10.1111/ajd.12549 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/46963
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Title
Assessing the validity and response distribution of the simplified psoriasis index in patients receiving phototherapy
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Abstract
© 2016 The Australasian College of Dermatologists Background/Objectives: The simplified psoriasis index (SPI) is a three-part multidimensional tool incorporating disease severity, psychosocial impact and historical course completed by the health-care professional (professional SPI, [proSPI]) or the patient (self-assessment SPI, [saSPI]). We aimed to assess the validity and response distribution of proSPI and saSPI in patients with psoriasis undergoing phototherapy. Methods: The validity and response distribution of SPI was assessed by recording saSPI and proSPI in patients with psoriasis before and after a course of phototherapy. Recruitment ended once 100 complete data sets were available for analysis. Results: Altogether 52 of the 100 patients evaluated were male and most (93) underwent narrowband UVB phototherapy. There was a close correlation between the proSPI-current severity score (proSPI-s) with the psoriasis area and severity index (PASI) score (r = 0.76, r = 0.86) before and after treatment, respectively. Although pretreatment correlation between the saSPI-current severity score (saSPI-s) and PASI was weak (r = 0.39), a more close correlation was noted at the end of treatment (r = 0.50). A moderate correlation was observed between the SPI-psychosocial impact score (SPI-p) and the dermatology life quality index (DLQI), both before and after phototherapy (r = 0.64, r = 0.73). The SPI had wide response distributions in all three domains. Conclusions: Both versions of SPI demonstrated wide response distributions and the proSPI-s in particular was shown to have good validity with PASI.