1. HD+CLOSE

(n = 16)

2. HD+DISTANT

(n = 16)

3. HD−

(n = 38)

Group comparisons

P^a

n

M

SD

n

M

SD

n

M

SD

1 - 3

2 - 3

1 - 2

Gender of affected parent^b (male/female)

8/8

50%

11/5

14/22^c

0.454

0.047^*

0.280

Age of onset of affected parent^a

43.4

(12.2)

49.3^d

(11.0)

47.0^e

(10.6)

0.272

0.791

0.237

CAG length of wildtype allele^a

18.8^t

(2.0)

18.3

(3.2)

20.7^g

(3.9)

0.091

0.035^*

0.577

CAG length of mutated allele^a

43.3

(2.4)

42.2

(3.3)

0.273

Estimated years to onset^a,h

6.5

(4.1)

22.3

(10.7)

<0.001^***