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To the Editor: We read with great interest the recent article by Coates and Helliwell on another definition of low disease activity using the novel composite indices to define remission in patients with psoriatic arthritis (PsA)1.In 2010, the same authors developed a composite outcome measure as a target of treatment for patients with PsA2. Minimal disease activity (MDA) criteria are fulfilled when 5/7 of the following criteria were satisfied: tender joint count ≤ 1; swollen joint count ≤ 1; Psoriasis Area and Severity Index ≤ 1 or body surface area ≤ 3; patient pain visual analog scale (VAS) score ≤ 15 mm; patient global disease activity VAS score of ≤ 20 … Address correspondence to Dr. Lubrano; E-mail: enniolubrano{at}hotmail.com

Defining Low Disease Activity States in Psoriatic Arthritis Using Novel Composite Disease Instruments