Measuring functioning in people with fibromyalgia (fm) based on the international classification of functioning, disability and health (icf)-a psychometric analysis
Pain Practice, 05/03/2012Prodinger B et al.
This study illustrates that it is possible to measure functioning as a unidimensional construct based on selected ICF categories from the components body functions, as well as activities and participation of the Brief ICF–Core–Set for CWP in patients with FM.
256 people with FM completed the Brief ICF–Core–Set.
The Rasch model was used for analysis.
Once ordering of response options of ICF categories was ensured, the following properties were studied: fit of the ICF categories to the Rasch model, the targeting between ICF categories and a person’s abilities, unidimensionality, and reliability.
Six ICF categories were rescored due to disordered thresholds.
Five ICF categories were removed due to high model–misfit and differential item functioning (DIF) for gender.
Scores from 46 participants were excluded due to extreme scores.
The ICF categories included display consistency with an underlying unidimensional construct, are free of DIF for age, disease duration and gender, display excellent overall reliability, and cover a range of functioning difficulties.
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