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

Journal article

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 Medical Outcome Survey Short-Form-36 item 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 OMERACT Filter 2.1 methodology. We calculated intra-class 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 one for SF-36 PF in PsA. The quality of the datasets was good. The ICCs for HAQ-DI were excellent in both datasets: 0.94 (95% CI: 0.88 to 0.97) and 0.94 (95% CI: 0.89 to 0.97). The ICC of SF-36 PF was good (0.89, 95% CI: 0.76 to 0.95). 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.

Authors: Leung, YY; Tillett, W; Hojgaard, P; Orbai, A-M; Holland, R

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Journal of Rheumatology
• Journal: Journal of Rheumatology
• Volume: 48
• Issue: 10
• Pages: 1547-1551
• Publication date: 2021-04-15
• Acceptance date: 2021-04-06
• DOI: 10.3899/jrheum.210175
• EISSN: 1499-2752
• ISSN: 0315-162X
• Pmid: 33858982
• Language: English
• Keywords: FFR; test-retest reliability; patient reported outcome; psoriatic arthritis; physical function