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Editor's Note
Nov 2012

Outcome Measures in DermatologyComment on “Measurement Properties of Outcome Measures for Vitiligo”

Arch Dermatol. 2012;148(11):1310. doi:10.1001/archdermatol.2012.3088

In the article by Vrijman et al, “construct” refers to any method used to determine the outcome of a clinical trial of the treatment of patients with vitiligo. Construct validity refers to the experimental demonstration that the construct (ie, method) actually measures what it claims to measure. Criterion validity refers to the experimental demonstration that the method compares with a well-accepted standard (“gold standard”). Structural validity refers to internal consistency of the method. (See: Mokkink LB, Terwee CB, Knol DL, et al. The COSMIN checklist for evaluating the methodological quality of studies on measurement properties: a clarification of its content. BMC Med Res Methodol. 2010;10:22.)

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