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Cross-cultural validity and differential item functioning of theOrthotics and Prosthetics Users’ Survey with Swedish and Americanusers of lower limb prosthesis
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Centre for Rehabilitation Research, Örebro County Council, Örebro, Sweden.
Rehabilitation Institute of Chicago, USA.
Centre for Rehabilitation Research, Örebro County Council, Örebro, Sweden.
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Northwestern University Feinberg School of Medicine, Chicago, USA.ORCID iD: 0000-0003-4247-2236
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Objective: To investigate the cross-cultural validity of the Orthotics and Prosthetics Users’ Survey (OPUS), to investigate differential item functioning (DIF) in the OPUS related to sex, age, amputation level and amputated sides (unilateral or bilateral), and to determine the known-group validity of the OPUS.

Design: Cross-sectional study design.

Setting: 2 outpatient clinics in Sweden and 7 outpatient clinics in the United States.

Participants: A total of 195 Swedish and 126 American adults using lower limb prosthesis.

Interventions: Not applicable.

Main Outcome Measure: 4 modules from the OPUS were used in this study, including the Lower extremity functional status (LEFS), Client satisfaction with device (CSD), Client satisfaction with services (CSS), and Health-related quality of life (HRQoL) modules. Items were scored on 4- or 5-level Likert scales, and a Rasch measure was calculated for each person and module.

Results: The cross-cultural validity was satisfactory. Many items demonstrated DIF related to country and demographic characteristics, but the impact on mean person measures was negligible. The rating scales of the CSD and CSS needed adjustments, and the unidimensionality of the CSD and CSS was weak. The differences between the mean measures of known patient groups were statistically significant for age in the LEFS and for the level of amputation in the CSD.

Conclusions: This study supports the validity of comparing OPUS measures between Sweden and USA and between patient groups with different demographic characteristics. The OPUS can, to some extent, discriminate between patient groups known to be different. The unidimensionality of the CSD and CSS modules is weaker than the other modules and these need further development and evaluation.

Keywords [en]
rehabilitation, artificial limbs, outcome assessment (health care), validation studies, cross-cultural comparison
National Category
Medical and Health Sciences
Research subject
Medicine
Identifiers
URN: urn:nbn:se:oru:diva-34968OAI: oai:DiVA.org:oru-34968DiVA, id: diva2:715628
Note

Detta manuskript har bearbetats till en artikel som är under publicering i tidskriften Archives of Physical Medicine and Rehabilitation

Available from: 2014-05-05 Created: 2014-05-05 Last updated: 2017-10-17Bibliographically approved
In thesis
1. The Orthotics and Prosthetics Users' Survey: translation and validity evidence for the Swedish version
Open this publication in new window or tab >>The Orthotics and Prosthetics Users' Survey: translation and validity evidence for the Swedish version
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Örebro: Örebro University, 2014. p. 99
Series
Örebro Studies in Medicine, ISSN 1652-4063 ; 104
Keywords
artificial limbs, orthotic devices, outcome assessment, validation studies, reproducability of results, activities of daily living, patient satisfaction, quality of life
National Category
Orthopaedics
Research subject
Orthopaedics; Medicine
Identifiers
urn:nbn:se:oru:diva-34587 (URN)978-91-7529-015-7 (ISBN)
Public defence
2014-05-09, Hörsal C2, hus Campus USÖ, Södra Grev Rosengatan, 703 62 Örebro, 13:00 (Swedish)
Opponent
Supervisors
Available from: 2014-04-04 Created: 2014-04-04 Last updated: 2018-01-11Bibliographically approved

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Jarl, GustavLindner, Helen Y.N.Norling Hermansson, Liselotte M.

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