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Composite scores in psoriatic arthritis 

Composite scores in psoriatic arthritis
Chapter:
Composite scores in psoriatic arthritis
Author(s):

Philip S. Helliwell

DOI:
10.1093/med/9780198737582.003.0025
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date: 11 December 2019

Composite scores are assessment tools that combine a number of separate evaluations into one score. The composite score generally has more statistical power than the individual items, is more responsive, and has a greater effect size. A composite score allows synthesis of several elements into one score which can then, if psychometrically appropriate, allow the determination of disease activity (both low and high) cut-offs, and response criteria. The topics discussed in this chapter are the development and use of composite scores to assess disease activity in psoriatic arthritis: their history and development, use in practice, psychometric characteristics, and relative merits. Although there is no overall consensus on which measure to use, either in clinical trials or in the clinic, there appears to be agreement that remission should be the ideal target of treatment, with minimal/low disease activity a feasible alternative.

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