CACNA1A and spinocerebellar ataxia type 6: The number of failed test items was also numerically higher in SCA6 patients, and to lesser degree in FRDA patients, compared to controls (SCA6: 2.1 ± 1.6 vs. SCA6 controls: 1.1 ± 1.2; FRDA: 1.5 ± 1.3 vs. FRDA controls: 1.1 ± 0.9).