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. Author manuscript; available in PMC: 2011 Jun 1.
Published in final edited form as: J Neurol Neurosurg Psychiatry. 2010 Sep 30;82(4):405–410. doi: 10.1136/jnnp.2010.208264

Table 1.

Demographic Information, Based on Group Assignment at Time 1

Prodromal Groups—Proximity to
Estimated Diagnosis
 Statistic
p-value		 Contrasts
Control Far
(>15
years)		 Mid
(9 to 15
years)		 Near
(<9
years)
N at Time 1 60 82 73 56 _ _
Gender (% Female) 71.7 64.6 63.0 69.6 Chi-sq = 1.5
p = 0.68
Mean Inter-scan
Interval (months)
(SD)		 24.1
(1.1)		 24.4
(1.6)		 24.4
(1.4)		 24.6
(1.9)		 F = 1.0
p = 0.39
Mean Age at Time 1
(SD)		 44.7
(10.7)		 37.8
(8.4)		 44.5
(10.6)		 47.3
(8.3)		 F = 13.1
p < 0.0001		 F < C, M, N
Mean CAG Repeat
Length (SD)		 19.8
(2.7)		 41.1
(1.6)		 42.2
(2.1)		 43.5
(3.0)		 F = 1399.7
p < 0.0001		 C < F < M < N
Mean UHDRS Motor
Score (SD)		 2.4
(2.6)		 4.8
(4.3)		 4.5
(4.9)		 9.7
(7.9)		 F = 20.8
p < 0.0001		 C < F, M < N