Metric properties of the Spinal Cord Independence Measure - Self Report in a community survey

The Spinal Cord Independence Measure - Self Report (SCIM-SR) is a self-report instrument for assessing functional independence of persons with spinal cord injury. This study examined the internal construct validity and reliability of the SCIM-SR, when administered in a community survey, using the Ra...

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Bibliographic Details
Published in:Journal of rehabilitation medicine 2016-02, Vol.48 (2), p.149-164
Main Authors: Prodinger, Birgit, Ballert, Carolina S, Brinkhof, Martin W G, Tennant, Alan, Post, Marcel W M
Format: Article
Language:English
Subjects:
Activities of Daily Living
Adult
Dependency
Disability Evaluation
Female
Humans
Injuries
Male
Measurement
Middle Aged
Paraplegics
Patient Reported Outcome Measures
Polls & surveys
Rasch model
Reliability
Reproducibility of Results
Self Report
Spinal cord
Spinal cord injuries
Spinal Cord Injuries - psychology
Spinal Cord Injuries - rehabilitation
Surveys and Questionnaires
Tetraplegics
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Summary:The Spinal Cord Independence Measure - Self Report (SCIM-SR) is a self-report instrument for assessing functional independence of persons with spinal cord injury. This study examined the internal construct validity and reliability of the SCIM-SR, when administered in a community survey, using the Rasch measurement model. Rasch analysis of data from 1,549 individuals with spinal cord injury who completed the SCIM-SR. In the initial analysis no fit to the Rasch model was achieved. Items were grouped into testlets to accommodate the substantial local dependency. Due to the differential item functioning for lesion level and degree, spinal cord injury-specific sub-group analyses were conducted. Fit to the Rasch model was then achieved for individuals with tetraplegia and complete paraplegia, but not for those with incomplete paraplegia. Comparability of ability estimates across sub-groups was attained by anchoring all sub-groups on a testlet. The SCIM-SR violates certain assumptions of the Rasch measurement model, as shown by the local dependency and differential item functioning. However, an intermediate solution to achieve fit in 3 out of 4 spinal cord injury sub-groups was found. For the time being, therefore, it advisable to use this approach to compute Rasch-transformed SCIM-SR scores.
ISSN:1650-1977
1651-2081
DOI:10.2340/16501977-2059