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Modification of the Psoriatic Arthritis Disease Activity Score (PASDAS)
  1. Philip S Helliwell1,2,
  2. Robin Waxman1
  1. 1University of Leeds, Leeds Institute of Rheumatic and Musculoskeletal Medicine, Leeds, UK
  2. 2Musculoskeletal Biomedical Research Unit, Leeds Teaching Hospitals NHS Trust, Leeds, UK
  1. Correspondence to Dr Philip S Helliwell, Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, 2nd Floor, Chapel Allerton Hospital, Harehills Lane, Leeds LS7 4SA, UK; p.helliwell{at}

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Psoriatic arthritis is a complex heterogeneous disease manifesting with skin disease and a number of musculoskeletal abnormalities including arthritis, enthesitis, dactylitis and spondylitis. While not all of these manifestations are present in every patient, assessment of disease activity should account for these domains. To combine these domains into one composite score has been challenging but several have been developed. The Psoriatic Arthritis Disease Activity Score (PASDAS) was developed as part of an international Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) exercise.1 This measure includes physician-reported and patient-reported outcome measures combined into a composite index. The PASDAS requires the patient to complete a visual analogue scale and the short form 36 (SF36). The latter consists of 36 questions covering domains of physical and mental health. A shorter, 12 …

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  • Contributors Both authors contributed equally to this letter.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.