Table 1.

Descriptive statistics of controls, premanifest and manifest participants

Characteristic	Controls N = 15	PMHD N = 12	MHD N = 17
Age (years)	51 (10)	43 (10)	50 (11)
CAG	20 (3)	42 (2)	44 (3)
Male/femalea, b	7/8	6/6	8/9
Level of educationa, b (lower/middle/higher)	1/9/5	0/9/3	2/11/12
Intelligence Quotient (IQ)	107 (8)	105 (8)	101 (12)
Disease burden		251 (75)	404 (81)

Descriptive statistics are presented as mean (standard deviation), except for ^a which is total number. IQ was measured by the National Adult Reading Test (Dutch version). Disease burden is age (CAG-35.5)

^bPearson Chi-square test