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Measurement Properties of the Spinal Cord Injury-Functional Index (SCI-FI) Short Forms

Published:March 05, 2014DOI:https://doi.org/10.1016/j.apmr.2014.01.031

      Abstract

      Objective

      To evaluate the psychometric properties of the Spinal Cord Injury-Functional Index (SCI-FI) short forms (basic mobility, self-care, fine motor, ambulation, manual wheelchair, and power wheelchair) based on internal consistency; correlations between short forms banks, full item bank forms, and a 10-item computer adaptive test version; magnitude of ceiling and floor effects; and test information functions.

      Design

      Cross-sectional cohort study.

      Setting

      Six rehabilitation hospitals in the United States.

      Participants

      Individuals with traumatic spinal cord injury (N=855) recruited from 6 national Spinal Cord Injury Model Systems facilities.

      Interventions

      Not applicable.

      Main Outcome Measures

      SCI-FI full item bank, 10-item computer adaptive test, and parallel short form scores.

      Results

      The SCI-FI short forms (with separate versions for individuals with paraplegia and tetraplegia) demonstrate very good internal consistency, group-level reliability, excellent correlations between short forms and scores based on the total item bank, and minimal ceiling and floor effects (except ceiling effects for persons with paraplegia on self-care, fine motor, and power wheelchair ability and floor effects for persons with tetraplegia on self-care, fine motor, and manual wheelchair ability). The test information functions are acceptable across the range of scores where most persons in the sample performed.

      Conclusions

      Clinicians and researchers should consider the SCI-FI short forms when computer adaptive testing is not feasible.

      Keywords

      List of abbreviations:

      CAT (computer adaptive testing), IRT (item response theory), SCI (spinal cord injury), SCI-FI (Spinal Cord Injury-Functional Index), SF (short form)
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