Expert evaluations of fatigue questionnaires used in rheumatoid arthritis: a Delphi study among patients, nurses and rheumatologists in the Netherlands
Nikolaus, S. and Bode, C. and Taal, E. and Laar van de, M.A.F.J. (2012) Expert evaluations of fatigue questionnaires used in rheumatoid arthritis: a Delphi study among patients, nurses and rheumatologists in the Netherlands. Clinical and experimental rheumatology, 30 (1). 79 - 84. ISSN 1593-098x
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Evaluating fatigue items from traditional questionnaires and a new scale (BRAF-MDQ) by experts in rheumatoid arthritis (RA). This evaluation was part of a study to select fatigue items to develop an item bank for a Dutch computer-adaptive test (CAT) for RA. Experts` opinions were incorporated since they are essential for content validity of measurement instruments.
The 60 items of the SF-36 subscale vitality, FACIT-F, POMS subscale fatigue/inertia, MAF and the recently developed BRAF-MDQ were evaluated by rheumatologists, nurses and RA patients in a Delphi procedure. Items were selected for development of the item bank/CAT if rated as adequate by at least 80% of the participants (when 50% or less they were excluded). On the basis of participants` comments, remaining items were re-worded and re-evaluated in the following round. The procedure stopped when all items were selected or rejected.
Ten rheumatologists, 20 nurses and 15 RA patients participated. After the first round, 40% of the traditional items and 60% of the BRAF-MDQ items were directly selected and 3 items of the traditional questionnaires and 1 item of the BRAF-MDQ were directly excluded. Remaining items were re-worded, eight of which were presented for re-evaluation in the second round. Finally, 90% of the items from the traditional questionnaires and 95% of the items from the new BRAF-MDQ were included in our item pool.
Fifty-five of the 60 items (92%) from fatigue questionnaires proved to have good content validity and were feasible for use in the Netherlands, some after adaptation.
Behavioural Sciences (BS)
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