科研之友
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摘要
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 %26 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 %26 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.
