Annals of Rheumatic Diseases
Published online: 12 February 2018
DOI: http://dx.doi.org/10.1136/annrheumdis-2017-211996
Richard Holland1,2, William Tillett1,3, Eleanor Korendowych1, Charlotte Cavill1, Nicola Waldron1, Melanie Brooke1, Neil J McHugh1,3
Objectives: The Psoriatic Arthritis Impact of Disease (PsAID) Questionnaire is a recently developed patient-reported outcome measure (PROM) of disease impact in psoriatic arthritis (PsA). We set out to assess the validity in an independent cohort of patients, estimate the minimally important difference for improvement and explore the potential of individual components of the PsAID in clinical practice.
Methods: Data were collected prospectively for a single-centre cohort of patients with PsA. Construct validity was assessed by Spearman correlation with other PROMs and reliability by intraclass correlation coefficient (ICC) at 1 week. Sensitivity to change at 3 months was determined by the standardised response mean (SRM) in those patients with active disease requiring a change in treatment.
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