Evaluation of physical function in patients with inflammatory myopathies using the health assessment questionnaire-II (HAQ-II)
Authors' conclusion
HAQ-II demonstrated high internal consistency, no significant floor or ceiling effects, adequate validity and responsiveness for assessing physical function in patients with IIM
Study context
- Population
- Adults with idiopathic inflammatory myopathies (IIM) enrolled in Forward Databank (2005–2023) with available HAQ-II datamean age 54.8 years
- Participants
- 192 adults
- Outcome
- Measurement properties of HAQ-II: internal consistency, floor and ceiling effects, discriminant and construct validity, responsiveness
Methodological detailsregistry-based (Forward Databank 2005-2023), linear mixed models adjusted for age, sex and obesity
- Registry-based (Forward Databank 2005-2023)
- Linear mixed models adjusted for age, sex and obesity
Performance
As reported in the abstract
HAQ-II measurement properties
- Internal consistency (Cronbach's α)
- 0.93
- Discriminant validity: significant score differences across groups stratified by SF-36 physical function, pain, fatigue and disease activity
- all p < 0.0001
- Construct validity: a priori hypotheses met
- 15 of 17
Original publication
Evaluation of physical function in patients with inflammatory myopathies using the health assessment questionnaire-II (HAQ-II). Semin Arthritis Rheum. Published 3 June 2026. doi:10.
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