Validity of the Brief Illness Perception Questionnaire in people with knee pain: a Rasch analysis
Authors' conclusion
The 1-10 rating scale used in the Danish B-IPQ targeting knee pain is suboptimal, while a 0-2 scale improves the psychometric properties of the scale. The B-IPQ does not present unidimensionality and the use of a sum score is therefore not recommended when assessing IP. The B-IPQ may not cover the extent of IP in elderly people with knee pain.
Study context
- Population
- Elderly people reporting knee pain, Frederiksberg Cohort
- Participants
- 836 people
- Outcome
- Psychometric properties of the eight B-IPQ items (reliability and validity as a measure of illness perception)
Methodological detailsRasch analysis, cohort data (Frederiksberg Cohort)
- Rasch analysis
- Cohort data (Frederiksberg Cohort)
Performance
As reported in the abstract
Psychometric properties of the B-IPQ (Rasch analysis)
Rescaling to a 0-2 rating scale resolved disordering in six items
6
Items with underfit misfit
2
Items with overfit misfit
4
Person separation index: items separate respondents into only two illness perception (IP) levels
2
Original publication
Validity of the Brief Illness Perception Questionnaire in people with knee pain: a Rasch analysis. Scand J Rheumatol. Published 26 September 2023. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →