Psoriasis

Abstract
A scale for the objective measurement of severity of psoriasis is presented for application to long-term studies of the course of the disease and possible related factors. A group of dermatologists and a group of hospitalized patients ranked a series of 50 features of psoriasis on a self-anchoring scale ranging from 1 to 7 with 1 as indicative of mildest possible psoriasis and 7 as indicative of worst possible psoriasis. A final scale of features with low variance was constructed. Differences between objective and subjective evaluation of severity are stressed.

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