Allen W Heinemann1, Marcel P Dijkers2, Pengsheng Ni3, David S Tulsky4, Alan Jette3. 1. Center for Rehabilitation Outcomes Research, Rehabilitation Institute of Chicago, Chicago, IL; Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, IL. Electronic address: a-heinemann@northwestern.edu. 2. Rehabilitation Medicine, Icahn School of Medicine at Mount Sinai, New York, NY. 3. Health and Disability Research Institute, Boston University School of Public Health, Boston, MA. 4. Department of Rehabilitation Medicine, Rusk Institute, New York, NY; Department of Orthopedic Surgery, Langone Medical Center, New York, NY.
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.
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.
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