SciELO - Scientific Electronic Library Online

vol.85 issue5Progressive macular hypomelanosis: an epidemiological study and therapeutic response to phototherapyTattooing: profile and discourse of individuals with marks in the body author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Anais Brasileiros de Dermatologia

Print version ISSN 0365-0596


FARIA, Joana Ribeiro Costa de et al. Inter-rater concordance study of the PASI (Psoriasis Area and Severity Index). An. Bras. Dermatol. [online]. 2010, vol.85, n.5, pp.625-629. ISSN 0365-0596.

BACKGROUND: Developed in 1978, the PASI (Psoriasis Area and Severity Index) is a method to rate psoriasis severity. Since then, it has been criticized for being extremely long, complex and for yielding significantly divergent interpretations. OBJECTIVE: To determine the PASI inter-rater reliability among three independent evaluators examining the same patients. METHODS:Cross-sectional study conducted in 2007 at a psoriasis treatment center, where 20 patients were selected. The patients were evaluated by three postgraduate students of Dermatology who independently determined the PASI of each patient. The inter-rater reliability coefficient was determined by employing intraclass correlation coefficients (ICC) and Bland & Altman plots. RESULTS: An ICC of 0.729 (IC 95%: 0.440 - 0.882) showed a significant degree of concordance among evaluators. By graphic means, the Bland & Altman plot method presents concordance gap ranges. As shown in this study, narrow gap ranges indicate a good concordance degree. It was also observed that for high PASI values, wider concordance gap ranges predominate. CONCLUSION: Based on this analysis, we may conclude that the PASI is a reliable indicator of psoriasis severity because it shows significant concordance when independent evaluations are performed.

Keywords : Cross-sectional studies; Psoriasis; Reproducibility of results.

        · abstract in Portuguese     · text in English | Portuguese     · English ( pdf ) | Portuguese ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License