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Qual Life Res. 2019 Apr 26. doi: 10.1007/s11136-019-02188-8. [Epub ahead of print]

Psychometric properties and cross-language equivalence of the revised Bristol Rheumatoid Arthritis Fatigue and the Rheumatoid Arthritis Impact of Disease scales in rheumatoid arthritis.

Author information

1
Department of Psychology, Health and Technology, University of Twente, PO BOX 50 000, 7500 KA, Enschede, The Netherlands. A.H.Oudevoshaar@utwente.nl.
2
Department of Psychology, Health and Technology, University of Twente, PO BOX 50 000, 7500 KA, Enschede, The Netherlands.
3
University of West England, Bristol, UK.
4
Sorbonne Université, Paris, France.
5
Rheumatology Department, Pitié Salpêtrière Hospital, APHP, Paris, France.
6
Department for Rheumatology, Arthritis Centre Twente, Medisch Spectrum Twente, Enschede, The Netherlands.

Abstract

OBJECTIVE:

To assess psychometric properties and cross-language measurement equivalence of six versions of the Bristol Rheumatoid Arthritis Fatigue Scale (BRAF-MDQ) and the Rheumatoid Arthritis Impact of Disease Score (RAID in rheumatoid arthritis (RA).

METHODS:

Both questionnaires were completed by French (n = 206), German (n = 206), Dutch (n = 317), Spanish (n = 157), Swedish (n = 170) and UK (n = 210) RA patients. The presence of cross-language differential item functioning (DIF) was examined using the generalized partial credit model. The impact of DIF on the item and total scores was examined by comparing DIF unadjusted and DIF adjusted expected item and scale scores. IRT-based methods were used to assess psychometric properties of the instruments.

RESULTS:

11 of the 20 BRAF-MDQ (55%) and 4 of the 7 RAID items (57%) exhibited significant DIF in at least one of the six countries. The mean number of items with DIF per country was 2.6 for BRAF-MDQ and 1.1 for RAID. However, the impact of DIF on the total RAID and BRAF-MDQ scores, as well as the BRAF subscales, was found to be negligible at the group level. Only for the BRAF physical subscale was there evidence of minor DIF. Marginal reliabilities of BRAF-MDQ (0.93) and RAID (0.89) were excellent, and precise scores could be obtained across the spectrum of disease impact and fatigue scores measured by these PROMs.

CONCLUSION:

This study supports the cross-language measurement equivalence of BRAF-MDQ and RAID and provides further support for the psychometric properties of these measures in RA.

KEYWORDS:

Differential item functioning; Disease impact; Fatigue; Item response theory; Patient reported outcome; Reliability; Rheumatoid arthritis; Validity

PMID:
31028510
DOI:
10.1007/s11136-019-02188-8

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