Assessing internal construct validity of DAPSA and DAPSA28 in psoriatic arthritis: a European observational study using confirmatory factor analysis and additional psychometric testing
Overall, the model fit was acceptable across model fit statistics, supporting internal construct validity, but some evidence of misfit at country level was disclosed. Our findings support acceptable internal consistency reliability, but DIF was found for sex and country. Based on mixed results of model fit and DIF, further investigation of these and other PsA disease activity measures is warranted.
Authors
- Jacob Brauner Jørgensen (ORCID: https://orcid.org/0000-0002-6533-6336)
- Adrian Ciurea (ORCID: https://orcid.org/0000-0002-7870-7132)
- Jakub Závada (ORCID: https://orcid.org/0000-0002-9802-6545)
- Brigitte Michelsen (ORCID: https://orcid.org/0000-0003-0103-2840)
- Sigrid Vorobjov
- Karin Laas
- Michael John Nissen (ORCID: https://orcid.org/0000-0002-6326-1764)
- Laura Kuusalo (ORCID: https://orcid.org/0000-0001-5238-8439)
- Lykke Midtbøll Ørnbjerg (ORCID: https://orcid.org/0000-0002-7832-6831)
- T. H. Löve
- Dan Nordström
- Merete Lund Hetland (ORCID: https://orcid.org/0000-0003-4229-6818)
- J. Heberg (ORCID: https://orcid.org/0000-0001-6129-9235)
- Bente Glintborg (ORCID: https://orcid.org/0000-0002-8931-8482)
- Corina Mogoşan (ORCID: https://orcid.org/0000-0002-2790-4646)
- Karl Bang Christensen (ORCID: https://orcid.org/0000-0003-4518-5187)
- Joana Borges
- Karel Pavelka (ORCID: https://orcid.org/0000-0002-9324-1377)
- Mikkel Østergaard
- Bjorn Gudbjornsson
- Catalin Codreanu
- Simon Horskjær Rasmussen
- Florenzo Iannone
- Anne Gitte Loft
- Fabrizio Conti
Institutions
- Reykjavík University (IS)
- University of Copenhagen (DK)
- University of Turku (FI)
- University of Iceland (IS)
- University of Zurich (CH)
- Aarhus University (DK)
- Charles University (CZ)
- Helsinki University Hospital (FI)
- Turku University Hospital (FI)
- Glostrup Hospital (DK)
- Aarhus University Hospital (DK)
- Copenhagen University Hospital (DK)
- Rigshospitalet (DK)
- Institute of Rheumatology (CZ)
- East Tallinn Central Hospital (EE)
- Sørlandet Hospital Arendal (NO)
- University Hospital of Zurich (CH)
- University Hospital of Geneva (CH)
- National University Hospital of Iceland (IS)
- Diakonhjemmet Hospital (NO)
- Instituto Português de Malacologia (PT)
- Sørlandet Sykehus (NO)
- Instituto Português de Reumatologia
- University of Bari Aldo Moro (IT)
- Sapienza University of Rome (IT)
Publication Details
- Journal
- RMD Open
- Published
- 2025-10-01
- DOI
- https://doi.org/10.1136/rmdopen-2025-006104
- Primary Topic
- Spondyloarthritis Studies and Treatments
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Amgen
- Eli Lilly and Company
- Pfizer
- AstraZeneca
- Sanofi
- Gilead Sciences
- Biogen
- Celgene
- Regeneron Pharmaceuticals
- Celltrion
- NordForsk
- Swedish Orphan Biovitrum
- H. Lundbeck A/S
- Medac
- Samsung
- Novartis Pharma