Test-retest reliability for HAQ-DI and SF-36 PF for the measurement of physical function in psoriatic arthritis

Ying Ying Leung, William Tillett, Pil Hojgaard, Ana Maria Orbai, Richard Holland, Ashish J. Mathew, Niti Goel, Jeffrey Chau, Christine A. Lindsay, Alexis Ogdie, Laura C. Coates, Robin Christensen, Philip J. Mease, Vibeke Strand, Dafna D. Gladman

Research output: Contribution to journalArticlepeer-review


Objective. Due to no existing data, we aimed to derive evidence to support test-retest reliability for the Health Assessment Questionnaire–Disability Index (HAQ-DI) and 36-item Short Form Health Survey physical functioning domain (SF-36 PF) in psoriatic arthritis (PsA). Methods. We identified datasets that collected relevant data for test-retest reliability for HAQ-DI and SF-36 PF, and evaluated them using Outcome Measures in Rheumatology (OMERACT) Filter 2.1 methodology. We calculated intraclass correlation coefficients (ICC) as a measure of test-retest reliability. We then conducted a quality assessment and evaluated the adequacy of test-retest reliability performance. Results. Two datasets were identified for HAQ-DI and 1 for SF-36 PF in PsA. The quality of the datasets was good. The ICCs for HAQ-DI were good and excellent in study 1 (0.90, 95% CI 0.79–0.95) and study 2 (0.94, 95% CI 0.89–0.97). The ICC for SF-36 PF was excellent (0.96, 95% CI 0.92–0.98). The performance of test-retest reliability for both instruments was judged to be adequate. Conclusion. The new data derived support good and reasonable test-retest reliability for HAQ-DI and SF-36 PF in PsA.

Original languageEnglish (US)
Pages (from-to)1547-1551
Number of pages5
JournalJournal of Rheumatology
Issue number10
StatePublished - Oct 1 2021


  • Patient-reported outcome
  • Physical function
  • Psoriatic arthritis
  • Test-retest reliability

ASJC Scopus subject areas

  • Rheumatology
  • Immunology and Allergy
  • Immunology


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