The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited
Objective: Since the 1990s the Functional Independence Measure (FIM™) was believed to measure 2 different constructs, represented by its motor and cognitive subscales. The practice of reporting FIM™ total scores, together with recent developments in the understanding of the influence of locally depe...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Medical Journals Sweden
2019-03-01
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| Series: | Journal of Rehabilitation Medicine |
| Subjects: | |
| Online Access: |
https://www.medicaljournals.se/jrm/content/html/10.2340/16501977-2525
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| _version_ | 1818907351157047296 |
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| author | Roxanne Maritz Alan Tennant Carolina Fellinghauer Gerold Stucki Birgit Prodinger |
| author_facet | Roxanne Maritz Alan Tennant Carolina Fellinghauer Gerold Stucki Birgit Prodinger |
| author_sort | Roxanne Maritz |
| collection | DOAJ |
| description | Objective: Since the 1990s the Functional Independence Measure (FIM™) was believed to measure 2 different constructs, represented by its motor and cognitive subscales. The practice of reporting FIM™ total scores, together with recent developments in the understanding of the influence of locally dependent items on fit to the Rasch model, raises the question of whether the FIM™ 18-item version can be reported as a unidimensional interval-scaled metric.
Design: Rasch analysis of the FIM™ using testlet approaches to accommodate local response dependency.
Patients: A calibration sample containing 946 cases of data from 11,103 patients undergoing neurological or musculoskeletal rehabilitation in Switzerland in 2016.
Results: Baseline analysis and the traditional testlet approach showed no fit with the Rasch model. When items were grouped into 2 testlets, fit to the Rasch model was achieved, indicating unidimensionality across all 18 items. A transformation table to convert FIM™ raw ordinal scores to the corresponding Rasch interval scaled values was created.
Conclusion: This study provides evidence that FIM™ total scores represent a unidimensional set of items, supporting their use in clinical practice and outcome reporting when applying the respective transformation table. This provides a basis for standardized reporting of functioning. |
| first_indexed | 2024-12-19T21:53:44Z |
| format | Article |
| id | doaj.art-ef3e92f1be13490b846479cbd950fda0 |
| institution | Directory Open Access Journal |
| issn | 1650-1977 1651-2081 |
| language | English |
| last_indexed | 2024-12-19T21:53:44Z |
| publishDate | 2019-03-01 |
| publisher | Medical Journals Sweden |
| record_format | Article |
| series | Journal of Rehabilitation Medicine |
| spelling | doaj.art-ef3e92f1be13490b846479cbd950fda02022-12-21T20:04:19ZengMedical Journals SwedenJournal of Rehabilitation Medicine1650-19771651-20812019-03-0151319320010.2340/16501977-25252501The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisitedRoxanne Maritz0Alan TennantCarolina FellinghauerGerold StuckiBirgit Prodinger Rehabilitation Services and Care Unit, Swiss Paraplegic Research, , 6207 Nottwil, Switzerland. roxanne.maritz@paraplegie.ch. Objective: Since the 1990s the Functional Independence Measure (FIM™) was believed to measure 2 different constructs, represented by its motor and cognitive subscales. The practice of reporting FIM™ total scores, together with recent developments in the understanding of the influence of locally dependent items on fit to the Rasch model, raises the question of whether the FIM™ 18-item version can be reported as a unidimensional interval-scaled metric. Design: Rasch analysis of the FIM™ using testlet approaches to accommodate local response dependency. Patients: A calibration sample containing 946 cases of data from 11,103 patients undergoing neurological or musculoskeletal rehabilitation in Switzerland in 2016. Results: Baseline analysis and the traditional testlet approach showed no fit with the Rasch model. When items were grouped into 2 testlets, fit to the Rasch model was achieved, indicating unidimensionality across all 18 items. A transformation table to convert FIM™ raw ordinal scores to the corresponding Rasch interval scaled values was created. Conclusion: This study provides evidence that FIM™ total scores represent a unidimensional set of items, supporting their use in clinical practice and outcome reporting when applying the respective transformation table. This provides a basis for standardized reporting of functioning. https://www.medicaljournals.se/jrm/content/html/10.2340/16501977-2525 outcome assessment (healthcare)psychometricsrehabilitationactivities of daily livingRasch measurement modelFunctional Independence Measure. |
| spellingShingle | Roxanne Maritz Alan Tennant Carolina Fellinghauer Gerold Stucki Birgit Prodinger The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited Journal of Rehabilitation Medicine outcome assessment (healthcare) psychometrics rehabilitation activities of daily living Rasch measurement model Functional Independence Measure. |
| title | The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited |
| title_full | The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited |
| title_fullStr | The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited |
| title_full_unstemmed | The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited |
| title_short | The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited |
| title_sort | functional independence measure 18 item version can be reported as a unidimensional interval scaled metric internal construct validity revisited |
| topic | outcome assessment (healthcare) psychometrics rehabilitation activities of daily living Rasch measurement model Functional Independence Measure. |
| url |
https://www.medicaljournals.se/jrm/content/html/10.2340/16501977-2525
|
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