The University of Southampton
University of Southampton Institutional Repository

Measuring functioning in people with fibromyalgia (FM) based on the International Classification of Functioning, Disability and Health (ICF) - a psychometric analysis

Measuring functioning in people with fibromyalgia (FM) based on the International Classification of Functioning, Disability and Health (ICF) - a psychometric analysis
Measuring functioning in people with fibromyalgia (FM) based on the International Classification of Functioning, Disability and Health (ICF) - a psychometric analysis
Objectives: Instruments to assess functioning in patients with FM vary considerably in their content and are often symptom-specific. This study aimed to examine whether it is feasible to construct a psychometric-sound clinical instrument to measure functioning in FM based on the Brief ICF-Core-Set for chronic widespread pain (CWP).

Methods: Two hundred and fifty six 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.

Results: 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.

Conclusions: 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.
1530-7085
255-265
Prodinger, Birgit
1bbe7d35-ca22-4e92-8d77-a9ea3e378dc8
Salzberger, Thomas
a7aa80ce-446c-4b2c-938b-086b45ae3424
Stucki, Gerold
0534525c-103b-45be-b0a5-061d8867ef0d
Stamm, Tanja
abe85120-cb3d-4b86-8e65-ad91c602445c
Cieza, Alarcos
a0df25c5-ee2c-4580-82b3-d0a75591580e
Prodinger, Birgit
1bbe7d35-ca22-4e92-8d77-a9ea3e378dc8
Salzberger, Thomas
a7aa80ce-446c-4b2c-938b-086b45ae3424
Stucki, Gerold
0534525c-103b-45be-b0a5-061d8867ef0d
Stamm, Tanja
abe85120-cb3d-4b86-8e65-ad91c602445c
Cieza, Alarcos
a0df25c5-ee2c-4580-82b3-d0a75591580e

Prodinger, Birgit, Salzberger, Thomas, Stucki, Gerold, Stamm, Tanja and Cieza, Alarcos (2012) Measuring functioning in people with fibromyalgia (FM) based on the International Classification of Functioning, Disability and Health (ICF) - a psychometric analysis. Pain Practice, 12 (4), 255-265. (doi:10.1111/j.1533-2500.2011.00488.x). (PMID:21797963)

Record type: Article

Abstract

Objectives: Instruments to assess functioning in patients with FM vary considerably in their content and are often symptom-specific. This study aimed to examine whether it is feasible to construct a psychometric-sound clinical instrument to measure functioning in FM based on the Brief ICF-Core-Set for chronic widespread pain (CWP).

Methods: Two hundred and fifty six 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.

Results: 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.

Conclusions: 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.

This record has no associated files available for download.

More information

e-pub ahead of print date: 29 July 2011
Published date: April 2012
Organisations: Psychology

Identifiers

Local EPrints ID: 340820
URI: http://eprints.soton.ac.uk/id/eprint/340820
ISSN: 1530-7085
PURE UUID: 650e974e-941e-4020-91c6-e1ccd8fec157

Catalogue record

Date deposited: 03 Jul 2012 13:00
Last modified: 14 Mar 2024 11:30

Export record

Altmetrics

Contributors

Author: Birgit Prodinger
Author: Thomas Salzberger
Author: Gerold Stucki
Author: Tanja Stamm
Author: Alarcos Cieza

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×