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Rheumatology Advance Access published online on June 6, 2006
Rheumatology, doi:10.1093/rheumatology/kel171
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© The Author 2006. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received February 16, 2006
Accepted April 11, 2006

Concise Report

Validation of a Dutch translation of the fibromyalgia impact questionnaire

T. R. Zijlstra 1 *, E. Taal 2, M. A. F. J. van de Laar 3, and J. J. Rasker 2

1 Department of Rheumatology, Medisch Spectrum Twente Hospital, University of Twente, Enschede, The Netherlands
2 Department of Communication Studies, University of Twente, Enschede, The Netherlands
3 Department of Rheumatology, Medisch Spectrum Twente Hospital, University of Twente, Enschede, The Netherlands; Department of Communication Studies, University of Twente, Enschede, The Netherlands

* To whom correspondence should be addressed.
T. R. Zijlstra, E-mail: tr.zijlstra{at}worldonline.nl


  Abstract

Objectives. To validate a Dutch translation of the fibromyalgia impact questionnaire (FIQ).

Materials and methods. Data were taken from two randomized clinical trials on Spa treatment and venlafaxine in fibromyalgia (FM). Participants completed the Dutch FIQ and a set of validated questionnaires for general health (RAND-36), depression (Beck depression inventory, BDI), pain (McGill pain questionnaire, MPQ) and fatigue (checklist individual strength, CIS). Internal consistency within the FIQ item ‘physical functioning’ was studied using Cronbach's {alpha}. Test-retest reliability was studied with intra-class-correlation (ICC) in a subsample of 76 control subjects over a 3 month period without specific intervention. Construct validity was evaluated by correlating the FIQ to other questionnaires. Sensitivity to change was studied using standardized response means (SRM).

Results. The study sample consisted of 213 women and 11 men (mean age 47 yrs, mean disease duration 11 yrs). Cronbach's {alpha} for the item ‘physical functioning’ was 0.91, indicating high internal consistency. Test-retest reliability was acceptable, with ICC ranging from 0.45 for ‘morning tiredness’ to 0.71 for ‘physical function’. FIQ correlated significantly with the RAND-36, with Spearman's {rho} ranging from -0.60 to -0.70 for items measuring the same concept. Similar patterns of correlation were seen with MPQ, BDI and CIS. Sensitivity to change was sufficient, with SRM after Spa treatment ranging from 0.3 for ‘work days missed’ to 0.9 for ‘days felt good’. Similar SRM were found in the venlafaxine trial for patients reporting general improvement.

Conclusion. The Dutch FIQ is a valid instrument for measuring health status in FM, showing sufficient reliability, construct validity and responsiveness.

Keywords: Fibromyalgia impact questionnaire; Fibromyalgia; Dutch version; Validation; Health assessment.
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