Psychometric evaluation of the Norwegian version of the Revised Fibromyalgia Impact Questionnaire

Objectives The Revised Fibromyalgia Impact Questionnaire (FIQ-R) is a composite questionnaire covering key domains of fibromyalgia disease burden. This study aimed to translate the FIQ-R into Norwegian, to assess face, content, and criterion validity, and to evaluate the psychometric properties of the Norwegian FIQ-R using Rasch analysis, in a sample of adults with fibromyalgia. Method The FIQ-R was translated into Norwegian following established methodology in collaboration with patient research partners. Participants attending a patient education session for people with chronic musculoskeletal pain were asked to complete, anonymously, the translated FIQ-R, Fibromyalgia Self-reported Diagnostic Criteria (FSDC), 36-item Short Form Health Survey (SF-36), and Modified Health Assessment Questionnaire (MHAQ). Fibromyalgia cases were identified according to the FSDC. Correlations between FIQ-R, MHAQ, and SF-36 were calculated. Rasch analysis was performed. Results In total, 241 participants (96.3% female) were classified as having fibromyalgia according to the FSDC. The translated FIQ-R had acceptable face and content validity. The correlation coefficients were moderate between FIQ-R and SF-36, and strong between FIQ-R and MHAQ. The FIQ-R formed a multidimensional scale, indicating two subscales: FIQ-R function and FIQ-R symptoms. Both subscales showed reversed threshold ordering and were consequently collapsed into five and four response categories, respectively. The resulting subscales were found to have good reliability and targeting. Conclusion Owing to the lack of unidimensionality in the FIQ-R, it is recommended that both clinical and research applications rely on subscale scores rather than a total score.

• Publication year

  2025

• Venue

  Scandinavian Journal of Rheumatology

• Publication date

  2025-11-10

• Fields of study

  Medicine, Psychology

• Identifiers
  DOI 10.1080/03009742.2025.2573532PMID 41211739
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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  2009influential reference
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  2009influential reference
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• Guidelines for the process of cross-cultural adaptation of self-report measures.

  2000influential reference
• The assessment of functional impairment in fibromyalgia (FM): Rasch analyses of 5 functional scales and the development of the FM Health Assessment Questionnaire.

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• The OMERACT filter for Outcome Measures in Rheumatology.

  1998influential reference
• Translation and performance of the Norwegian SF-36 Health Survey in patients with rheumatoid arthritis. I. Data quality, scaling assumptions, reliability, and construct validity.

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• The prevalence of fibromyalgia among women aged 20-49 years in Arendal, Norway.

  1992influential reference
• The fibromyalgia impact questionnaire: development and validation.

  1991cited by this paper
• The Medical Outcomes Study. An application of methods for monitoring the results of medical care.

  1989cited by this paper
• Item Discrimination: When More Is Worse

  1988cited by this paper
• Assessment of patient satisfaction in activities of daily living using a modified Stanford Health Assessment Questionnaire.

  1983cited by this paper
• Probabilistic Models for Some Intelligence and Attainment Tests

  1981cited by this paper
• Measurement of patient outcome in arthritis.

  1980cited by this paper
• A rating formulation for ordered response categories

  1978cited by this paper

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