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Performance of the Self-administered Psoriasis Area and Severity Index in Evaluating Clinical and Sociodemographic Subgroups of Patients With Psoriasis—Editor's Comment
Michael Bigby, MD
Arch Dermatol. 2003;139:357.
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This article is a welcome addition to the testing of the validity, reproducibility, and responsiveness of scales and indexes for measuring the severity of cutaneous diseases (see Bigby M, Gadenne A-S [Understanding and evaluating clinical trials. J Am Acad Dermatol. 1996;34:555-590] and Allen AM [Clinical trials in dermatology, III: measuring responses to treatment. Int J Dermatol. 1980;19:1-6]). The correlation between the PASI and SAPASI was strong-moderate (the Pearson correlation coefficients range from -1 [perfect negative correlation] to +1 [perfect positive correlation], with 0 representing no correlation). It assumes a linear relationship between the 2 variables. The degree of association is generally interpreted as follows: little if any (0-0.10), weak (0.20-0.39), weak-moderate (0.40-0.59), strong-moderate (0.60-0.79) or strong (0.80-1.00) (Glantz SA. Primer of Biostatistics. New York, NY: McGraw-Hill Co; 1992). The authors' assertion that the SAPASI can be a simple and convenient way to follow patients' . . . [Full Text of this Article]
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Performance of the Self-administered Psoriasis Area and Severity Index in Evaluating Clinical and Sociodemographic Subgroups of Patients With Psoriasis
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