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Predictors of loss of ambulation in Friedreich's ataxia

Friedreich's ataxia (FRDA) is a characterized by progressive loss of coordination and balance leading to loss of ambulation (LoA) in nearly all affected individuals. While transition to becoming fully wheelchair bound is a critical milestone in the disease course, it presents a particularly challenging prediction, mostly due to variability in inter- and intra-subject severity and progression. For these reasons, LoA or potential surrogates have been impractical as outcomes in clinical trials. The authors studied progressive features leading to LoA in participants enrolled into the Friedreich's Ataxia Clinical Outcome Measures Study (FA-COMS), a natural history study with currently 4606 yearly follow up visits in 1021 patients. Loss of specific functions related to walking and standing of the neurological Friedreich Ataxia Rating Scale (FARS) exams were evaluated using time to event methods. To account for different severities, patients were stratified by age of disease onset. Early onset FRDA patients (

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