ATXN1 and spinocerebellar ataxia type 1: Conversely, while our SCA1 cohort trended towards poorer performance relative to controls, this was not statistically significant, failing to replicate a finding in a cohort of 31 individuals with SCA1 (relative to n = 14 here) who had similar average age, onset age, and disease duration characteristics to our cohort.13 This discrepancy may similarly relate to differences in statistical power, particularly considering that we observed a moderate effect for higher CCAS-S fail score in the SCA1 group compared to controls.