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Establishing score equivalence of the Functional Independence Measure (FIM™) motor scale and the Barthel Index, utilising the International Classification of Functioning, Disability and Health (ICF) and Rasch Measurement Theory

  • Introduction: Two widely used outcome measures to assess functioning in neurological rehabilitation are the Functional Independence Measure (FIM™) and the Barthel Index. The current study aims to establish the equivalence of the total score of the FIM™ motor scale and the Barthel Index through the application of the International Classification of Functioning, Disability and Health, and Rasch measurement theory. Methods: Secondary analysis of a large sample of patients with stroke, spinal cord injury, and multiple sclerosis, undergoing rehabilitation was conducted. All patients were assessed at the same time on both the FIM™ and the Barthel Index. The International Classification of Functioning, Disability and Health Linking Rules were used to establish conceptual coherency between the 2 scales, and the Rasch measurement model to establish an exchange of the total scores. Results: Using the FIM™ motor scale, items from both scales linked to the International Classification of Functioning, Disability and Health d4 Mobility or d5 Self-care chapters. Their co-calibration satisfied the assumptions of the Rasch model for each of 3 diagnostic groups. A ceiling effect was observed for the Barthel Index when contrasted against the FIM™ motor scale. Conclusion: Having a Rasch interval metric to transform scores between the FIM™ motor scale and Barthel Index is valuable for monitoring functioning, meta-analysis, quality audits and hospital benchmarking.

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Author:Birgit Prodinger, R.J. O'Connor, G. Stucki, A. Tennant
URL:https://doi.org/10.2340/16501977-2225
Parent Title (English):Journal of Rehabilitation Medicine
Document Type:Article (peer reviewed)
Language:English
Publication Year:2017
Tag:Disability and health; ICF; International Classification of Functioning; Outcome measures; Patient outcome assessment
Volume:49
Issue:5
First Page:416
Last Page:422
Peer reviewed:Ja
faculties / departments:Fakultät für Angewandte Gesundheits- und Sozialwissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit