The symptoms of Friedreich ataxia (FA) affect the patients' health-related quality of life (HRQoL) and psychosocial health. FA leads to an increasing need for care, associated with an economic burden. Little is known about the impact of FA on daily lives and HRQoL. To fill that gap, the authors will assess patient-reported, psychosocial and economic outcomes using momentary data assessment via a mobile health application (app). The PROFA Study is a prospective observational study. Patients with FA (n=200) will be recruited at six European study centers (Germany, France and Austria). Patients will be interviewed at baseline in the study center and subsequently patients' health will be assessed at home via mobile health app. Patients will self-report ataxia severity, HRQoL, speech and hearing disabilities, coping strategies and well-being, health services usage, adverse health events and productivity losses due to informal care on a daily to monthly basis on the app for 6 months. This study aims to (1) validate measurements of HRQoL and psychosocial health, (2) assess the usability of the mobile health app, and (3) use descriptive and multivariate statistics to analyze patient-reported and economic outcomes and the interaction effects between these outcomes. Insights into the app's usability could be used for future studies using momentary data assessments to measure outcomes of patients with FA.

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