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The reliability of the wolf motor function test for assessing upper extremity function after stroke
D M Morris1, G Uswatte, J E Crago
1Division of Physical Therapy, University of Alabama, Birmingham 35294, USA. morrisd@uab.edu
Objective:
To examine the reliability of the Wolf Motor Function Test (WMFT) for assessing upper extremity motor function in adults with hemiplegia.
Design:
Interrater and test-retest reliability.
Setting:
A clinical research laboratory at a university medical center.
Patients:
A sample of convenience of 24 subjects with chronic hemiplegia (onset >1yr), showing moderate motor impairment.
Intervention:
The WMFT includes 15 functional tasks. Performances were timed and rated by using a 6-point functional ability scale. The WMFT was administered to subjects twice with a 2-week interval between administrations. All test sessions were videotaped for scoring at a later time by blinded and trained experienced therapists.
Main Outcome Measure:
Interrater reliability was examined by using intraclass correlation coefficients and internal consistency by using Cronbach's alpha.
Results:
Interrater reliability was.97 or greater for performance time and.88 or greater for functional ability. Internal consistency for test 1 was.92 for performance time and.92 for functional ability; for test 2, it was.86 for performance time and.92 for functional ability. Test-retest reliability was.90 for performance time and.95 for functional ability. Absolute scores for subjects were stable over the 2 test administrations.
Conclusion:
The WMFT is an instrument with high interrater reliability, internal consistency, test-retest reliability, and adequate stability.
