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Towards an ICF-based clinical measure of functioning in people with ankylosing spondylitis: a methodological exploration

Towards an ICF-based clinical measure of functioning in people with ankylosing spondylitis: a methodological exploration
Towards an ICF-based clinical measure of functioning in people with ankylosing spondylitis: a methodological exploration
Objective. To explore whether it is possible to construct clinical measures of functioning for patients with ankylosing spondylitis (AS) by integrating information obtained across categories of the International Classification of Functioning, Disability and Health (ICF).

Methods. Sixty-eight ICF categories that were identified as relevant by patients with AS and that covered body functions, structures, and activity and participation were analysed based on the Rasch model for ordered response options. The following properties were studied: unidimensionality, reliability, fit of the ICF categories to the Rasch model, the appropriateness of the order of the response options of the ICF qualifier, and the targeting between the ICF categories and the person's abilities.

Results. After accounting for disordered thresholds and misfitting ICF categories, a clinical measure of functioning for AS was proposed that contained 64 ICF categories. On the basis of a transformation table, the raw scores obtained by adding the answers to the 64 ICF categories can be transformed to the Rasch logit scale and to a meaningful interval scale ranging from zero to 100.

Conclusion. For the first time, it has been shown that clinical measures of functioning, in principle, can be constructed based on the comprehensive ICF framework covering body functions and structures and activities and participation domains. The results of this investigation are preliminary and must be validated, but they are promising and can contribute to the acceptance and usefulness of the ICF in clinical practice.
disability evaluation, outcome measures, ankylosing spondylitis, icf, functioning, rasch analyses
0963-8288
528-537
Cieza, A.
a0df25c5-ee2c-4580-82b3-d0a75591580e
Hilfiker, R.
aa1e77df-2650-4962-a07f-5a4def3561f9
Boonen, A.
939f0f30-960d-483e-aa0a-b972e178413b
van der Heijde, D.
eb1c275e-3155-4450-a6b8-1a1e510839b6
Braun, J.
024c00be-9a67-453c-9e95-742b0b2da834
Stucki, G.
a0a31092-5bde-4e54-a3b7-70427ac7923e
Cieza, A.
a0df25c5-ee2c-4580-82b3-d0a75591580e
Hilfiker, R.
aa1e77df-2650-4962-a07f-5a4def3561f9
Boonen, A.
939f0f30-960d-483e-aa0a-b972e178413b
van der Heijde, D.
eb1c275e-3155-4450-a6b8-1a1e510839b6
Braun, J.
024c00be-9a67-453c-9e95-742b0b2da834
Stucki, G.
a0a31092-5bde-4e54-a3b7-70427ac7923e

Cieza, A., Hilfiker, R., Boonen, A., van der Heijde, D., Braun, J. and Stucki, G. (2009) Towards an ICF-based clinical measure of functioning in people with ankylosing spondylitis: a methodological exploration. Disability and Rehabilitation, 31 (7), 528-537. (doi:10.1080/09638280802173475). (PMID:18608418)

Record type: Article

Abstract

Objective. To explore whether it is possible to construct clinical measures of functioning for patients with ankylosing spondylitis (AS) by integrating information obtained across categories of the International Classification of Functioning, Disability and Health (ICF).

Methods. Sixty-eight ICF categories that were identified as relevant by patients with AS and that covered body functions, structures, and activity and participation were analysed based on the Rasch model for ordered response options. The following properties were studied: unidimensionality, reliability, fit of the ICF categories to the Rasch model, the appropriateness of the order of the response options of the ICF qualifier, and the targeting between the ICF categories and the person's abilities.

Results. After accounting for disordered thresholds and misfitting ICF categories, a clinical measure of functioning for AS was proposed that contained 64 ICF categories. On the basis of a transformation table, the raw scores obtained by adding the answers to the 64 ICF categories can be transformed to the Rasch logit scale and to a meaningful interval scale ranging from zero to 100.

Conclusion. For the first time, it has been shown that clinical measures of functioning, in principle, can be constructed based on the comprehensive ICF framework covering body functions and structures and activities and participation domains. The results of this investigation are preliminary and must be validated, but they are promising and can contribute to the acceptance and usefulness of the ICF in clinical practice.

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More information

Published date: 2009
Keywords: disability evaluation, outcome measures, ankylosing spondylitis, icf, functioning, rasch analyses
Organisations: Psychology

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Local EPrints ID: 341345
URI: http://eprints.soton.ac.uk/id/eprint/341345
ISSN: 0963-8288
PURE UUID: 672bc2df-5764-41b0-8b04-079b74dddfcd

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Date deposited: 20 Jul 2012 09:07
Last modified: 14 Mar 2024 11:39

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Contributors

Author: A. Cieza
Author: R. Hilfiker
Author: A. Boonen
Author: D. van der Heijde
Author: J. Braun
Author: G. Stucki

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