Functional Performance Measures: Are They Superior to Self-Assessments?

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Abstract
It has been suggested that performance measures of functional status have several advantages over selfreport measures for both clinical and research purposes, including: greater patient acceptability, interpretability, reproducibility, sensitivity to change, and the focus on actual ability rather than presumed capability. This article challenges this assumed superiority of “objective,” “behavioral” measures by directly comparing self-assessments and blindly rated performance assessments on a specific item by task basis, using an identical rating format.

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