. Author manuscript; available in PMC: 2016 Apr 23.

Published in final edited form as: Neurosci Lett. 2015 Mar 18;593:114–117. doi: 10.1016/j.neulet.2015.03.027

Table 1.

Demographic and Clinical Characteristics of Genotyped Subjects

	ET Cases (N=321)	Controls (N=296)	Statistical test	p-value
% Male (n)	48.0 (154)	41.65 (123)	χ²=2.31	0.1285
Mean age at tremor onset (years) (SD)	44.2 (22.0)	NA	NA	NA
% with family history of ET (n)	29.3 (94)	NA	NA	NA
% Ashkenazi Jewish ancestry (n)^*	38.6 (124)	19.6 (58)	χ²=25.92	<.0001
% Age at onset • 40 yr (n)^**	39.9 (128)	NA	NA	NA
% Age at onset > 40 yr (n)^**	56.1 (180)	NA	NA	NA
% Age at onset ≤ 55 yr (n)^**	60.4 (194)	NA	NA	NA
% Age at onset > 55 yr (n)^**	35.5 (114)	NA	NA	NA
% Non-hispanic White (n)^***	93.8 (301)	86.1(255)	χ²=9.2	0.0024
% Non-hispanic Black (n)^***	2.2(7)	5.7(17)	χ²=4.32	0.0377
% Hispanic (n)^***	2.5(8)	4.1(12)	χ²=0.75	0.3865
% Non-hispanic White-AJ (n)^*	38.0(122)	18.9(56)	χ²=26.41	<.0001

P<.0001;

^**

Age at onset data not available for 13 ET cases.

^***

Ethnicity data not available on 5 ET cases and 12 controls. NA, Not applicable;