A comparison of two validated tests for upper limb function after stroke: The Wolf Motor Function Test and the Action...

Area of Science:

• Rehabilitation Medicine
• Neuroscience
• Clinical Assessment

Background:

• Stroke significantly impairs upper limb motor function, necessitating reliable assessment tools.
• The Action Research Arm Test (ARAT) and Wolf Motor Function Test (WMFT) are commonly used to evaluate motor recovery.
• Understanding the comparative clinimetric properties of these tests is crucial for clinical practice and research.

Purpose of the Study:

• To determine the concurrent validity between the ARAT and WMFT in stroke patients.
• To compare the reproducibility, internal consistency, and floor/ceiling effects of the ARAT and WMFT.
• To provide evidence for the selection of appropriate motor function assessment tools post-stroke.

Main Methods:

• Concurrent validity assessed using Spearman's rank correlation coefficients.
• Reproducibility evaluated via intraclass correlation coefficients (ICCs) and Bland-Altman plots.
• Internal consistency measured by Cronbach's alpha; floor and ceiling effects analyzed based on predefined boundaries.

Main Results:

• High concurrent validity observed between ARAT and WMFT (Spearman's coefficients 0.70–0.86).
• Excellent inter-rater and intra-rater reliability for both tests (ICCs 0.92–0.97).
• Both scales exhibited high internal consistency (>0.98) and no significant floor or ceiling effects.

Conclusions:

• The ARAT and WMFT possess strong clinimetric properties for assessing upper limb motor function in stroke survivors.
• High concurrent validity indicates substantial overlap in the constructs measured by both tests.
• These findings support the use of both ARAT and WMFT in clinical settings and research evaluating motor recovery after stroke.