The modified Friedreich Ataxia Rating Scale (mFARS) is a disease specific, exam-based neurological rating scale commonly used as an outcome measure in clinical trials. While extensive clinimetric testing indicates its validity in measuring disease progression, formal test-retest reliability was lacking. To fill this gap, the authors acquired results from screening and baseline visits of several large clinical trials and calculated intraclass correlation coefficients, coefficients of variance, standard error, and the minimally detectable changes. This study demonstrated excellent test-retest reliability of the mFARS, and its upright stability subscore.

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