Fibromyalgia & musculoskeletal pain
The validity of the Danish version of the Fibromyalgia Impact Questionnaire – Revised applied in a clinical setting: a Rasch analysis
Authors' conclusion
The FIQR should be considered as an instrument consisting of three separate subscales representing 'function', 'overall impact', and 'symptoms'.
Study context
- Population
- Danish patients diagnosed with chronic widespread pain and/or fibromyalgia (FM) at referral for specialist care, 1 January 2018 to 3 September 2020
- Participants
- 924 patients
- Outcome
- Psychometric properties of the Danish version of the FIQR
Methodological detailsRasch analysis, Rasch measurement methods, electronic touchscreen questionnaire at referral
- Rasch analysis
- Rasch measurement methods
- Electronic touchscreen questionnaire at referral
Performance
As reported in the abstract
Psychometric properties of the Danish FIQR (Rasch analysis)
- Multiple threshold disordering in the 0-10 category rating scale
- Principal component analysis suggested a multidimensional construct; Rasch analysis of the full Fibromyalgia Impact Questionnaire - Revised (FIQR) discontinued
- Collapsing to a 0-4 category scale solved remaining threshold disordering in both subscales ('function' and 'symptoms')
- Only the symptom subscale indicated multidimensionality
- Underfitting misfit of item 21 and overfitting misfit of item 12
- No significant differential item functioning by sex, ethnicity or education
Original publication
The validity of the Danish version of the Fibromyalgia Impact Questionnaire – Revised applied in a clinical setting: a Rasch analysis. Scand J Rheumatol. Published 4 August 2022. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →