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Cross-cultural validity and differential item functioning of the Orthotics and Prosthetics Users’ Survey with Swedish and American users of lower-limb prosthesis
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. (Outcome Measures in Rehabilitation)ORCID iD: 0000-0002-6410-2474
Rehabilitation Institute of Chicago, Chicago IL, United States; Feinberg School of Medicine, Northwestern University, Chicago IL, United States.
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. (Outcome Measures in Rehabilitation)ORCID iD: 0000-0002-5567-9431
Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. (Outcome Measures in Rehabilitation)ORCID iD: 0000-0003-4247-2236
2015 (English)In: Archives of Physical Medicine and Rehabilitation, ISSN 0003-9993, E-ISSN 1532-821X, Vol. 96, no 9, p. 1615-1626Article in journal (Refereed) Published
Abstract [en]

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

Design: Survey.

Setting: Outpatient clinics.

Participants: The sample (NZ321) consisted of Swedish (nZ195) and U.S. (nZ126) adults using lower-limb prostheses.

Interventions: Not applicable.

Main Outcome Measures: Four OPUS modules were used: lower extremity functional status, client satisfaction with device (CSD), client satisfaction with services (CSS), and health-related quality of life. Rasch analysis was used to calculate measures for persons and items.

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 CSD and CSS needed adjustments, and the unidimensionality of CSD and CSS was weak. The differences between the mean measures of known patient groups were statistically significant for 2 out of 6 comparisons.

Conclusions: This study supports the validity of OPUS measure comparisons between Sweden and the United States and between subgroups with different demographic characteristics. Some of the country-related DIF may reflect the different health care financing systems. The findings demonstrate that the OPUS can discriminate between certain patient groups. The results also challenge some of our preconceptions about persons with bilateral amputation, indicating that we might know these persons less well than we think.

Place, publisher, year, edition, pages
2015. Vol. 96, no 9, p. 1615-1626
Keywords [en]
Artificial limbs; Cross-cultural comparison; Outcome assessment (health care); Rehabilitation; Validation studies as topic
National Category
Occupational Therapy
Research subject
Occupational therapy
Identifiers
URN: urn:nbn:se:oru:diva-43879DOI: 10.1016/j.apmr.2015.03.003ISI: 000361081700008PubMedID: 25804528Scopus ID: 2-s2.0-84940462314OAI: oai:DiVA.org:oru-43879DiVA, id: diva2:798281
Note

Funding Agency:

United States by National Institute on Disability and Rehabilitation Research through Rehabilitation Engineering Research Center on Prosthetics and Orthotics H133E080009

Available from: 2015-03-26 Created: 2015-03-26 Last updated: 2019-03-27Bibliographically approved

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Jarl, Gustav M.Lindner, Helen YHermansson, Liselotte M N

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