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

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

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)


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
Pages (from-to)1547-1551
Number of pages5
JournalThe Journal of Rheumatology
Issue number10
Early online date15 Apr 2021
Publication statusPublished - 1 Oct 2021


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

ASJC Scopus subject areas

  • Immunology and Allergy
  • Rheumatology
  • Immunology


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