What do systematic reviews say?

Short‐term (1 week) change in quality of life scores related to communication as measured by validated communication assessments · people with speech disorder resulting from hereditary ataxias

Longer‐term (minimum 1 month) change in generic quality of life scores · people with speech disorder resulting from hereditary ataxias

Adverse effects (during study) · people with speech disorder resulting from hereditary ataxias

Longer‐term burdens (minimum 1 month) (for example, demands on caregivers, frequency of tests, restrictions on lifestyle) · people with speech disorder resulting from hereditary ataxias

Economic outcomes · people with speech disorder resulting from hereditary ataxias

Short‐term (1 week) percentage change (improvement) in overall speech production · people with speech disorder resulting from hereditary ataxias

Short‐term (1 week) change in isolated movement, objective and subjective measures of speech production SARA. Scale from: 0 to 6. Higher scores indicate more severe speech disorder. · people with speech disorder resulting from hereditary ataxias