Patient Reported Outcome Measures for Rheumatoid Arthritis Disease Activity: Rasch measurement theory to identify items and domains
Authors' conclusion
General health and Disease activity domain items are not interchangeable. Twelve items form an item pool that can be used to measure the construct of RA DA.
Study context
- Population
- People with RA sent questionnaires including 10 legacy patient-reported outcome measures (PROMs)original 398, validation 293
- Participants
- 691 people
- Outcome
- Which items could be used to measure the construct of RA disease activity
Methodological detailsRasch measurement theory analyses, original and validation datasets, principal component analysis, confirmatory factor analyses bifactor models
- Rasch measurement theory analyses
- Original and validation datasets
- Principal component analysis
- Confirmatory factor analyses bifactor models
Performance
As reported in the abstract
Items measuring the construct of RA disease activity
- Set of Pain, Disease activity, Tenderness and swelling, Physical functioning and Stiffness domain items can measure the construct of RA disease activity (items)
- 12
Further findings
- No legacy PROMs fully fit the Rasch measurement model
Original publication
Patient Reported Outcome Measures for Rheumatoid Arthritis Disease Activity: Rasch measurement theory to identify items and domains. Rheumatology (Oxford). Published 22 April 2025. doi:10.
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