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Validity of a performance-based test of function in essential tremor.
E D Louis1, K J Wendt, S M Albert
1Department of Neurology, Gertrude H. Sergievsky Center, College of Physicians and Surgeons, Columbia University, New York, NY, USA.
Archives of Neurology
|July 15, 1999
Summary
A new performance-based test objectively measures functional impairment in essential tremor (ET). This validated tool aids in assessing tremor
Area of Science:
- Neurology
- Movement Disorders
- Clinical Assessment Tools
Background:
- Essential tremor (ET) management hinges on functional impact, yet current assessments lack objectivity.
- Neurological exams and computerized analyses do not measure function effectively.
- Subjective questionnaires are limited; performance-based tests offer an objective alternative for assessing ET's functional impact.
Observation:
- A 15-item, 10-minute performance-based test was developed for essential tremor (ET) assessment.
- The test demonstrated strong internal consistency (Cronbach alpha = .92).
- Validity was confirmed through significant correlations with ET screening questions, a disability questionnaire, a videotaped examination, and quantitative tremor analysis.
Findings:
- The performance-based test is internally consistent and valid for assessing functional impairment in ET.
- It correlates well with established measures of ET severity and impact.
- This objective measure provides a reliable way to quantify functional capacity in ET patients.
Implications:
- This validated performance-based test offers an objective method for evaluating functional capacity in essential tremor (ET).
- It is valuable for therapeutic trials, providing quantifiable data on tremor's functional impact.
- The test can improve clinical decision-making and treatment efficacy assessment in ET.