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Table 1 Sample Characteristics
| CAG repeat length (range) | ||||||
|---|---|---|---|---|---|---|
| Group | n | Age at onset (range) | Age at baseline (range) | Follow-up period | Normal allele | Expanded allele |
| SCA1 | 2 | 30.5y (30–31) | 36y (36) | 6.5y | 30.5 (29–32) | 50.5 (50–51) |
| SCA2 | 2 | 40.5y (37–44) | 52.5y (50–55) | 7y | 21.5 (21–22) | 41 (41) |
| SCA3 | 2 | 32.5y (25–40) | 45y (37–50) | 8y | 16 (14–20) | 72.3 (70–74) |
| SCA6 | 4 | 47.5y (28–59) | 42.5y (41–65) | 7y | 12.3 (11–13) | 22.5 (22–23) |
| SCA7 | 3 | 33.7y (29–38) | 42.3y (38–50) | 7y | 13.7 (12–15) | 56.3 (46–65) |
