The reliability of the wolf motor function test for assessing upper extremity function after stroke

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 (o nset > 1yr), showing moderate motor impairment. Intervention: The WMFT includes 15 functional tasks. Performances were time d and rated by using a 6-poinr functional ability scale. The WMFT was admin istered to subjects twice with a 2-week interval between administrations. A ll 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 intracla ss correlation coefficients and internal consistency by using Cronbach's al pha. 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 wa s .86 for performance time and .92 for functional ability. Test-retest reli ability was .90 for performance time and .95 for functional ability. Absolu te Scores for subjects were stable over the 2 test administrations. Conclusion: The WMFT is an instrument with high interrater reliability, int ernal consistency, test-retest reliability, and adequate stability. (C) 2001 by the American Congress of Rehabilitation Medicine and the Americ an Academy of Physical Medicine and Rehabilitation.