Background And Purpose: The Scale for Assessment and Rating of Ataxia (SARA) is a widely used clinical scale. The objective was to study the age dependence of SARA in healthy adults and to define age-specific cut-off values to differentiate healthy from ataxic individuals.
Methods: Data from 390 healthy individuals and 119 spinocerebellar ataxia patients were analyzed. SARA scores were mapped on functional SARA (fSARA). Age-adjusted cut-off values were determined by receiver operating characteristic curve analysis.
Results: The cut-off value was 3 for SARA and 1.5 for fSARA. Older patients had higher SARA cut-off values (4.5 for 60-69 years and 6.5 for 70-79 years). Age-adjusted cut-off values for fSARA are 1 for 18-29, 30-39 and 50-59 years, 2 for 40-49 and 60-69 years and 3 for 70-79 years. Sensitivity and specificity were higher for SARA than for fSARA.
Conclusion: In this study, age-dependent cut-off values were defined for SARA and fSARA. The results may be relevant for the design of future preventive trials in spinocerebellar ataxias that use conversion to ataxia as an outcome.
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