. Author manuscript; available in PMC: 2016 May 10.

Published in final edited form as: Eur J Neurol. 2012 Nov 1;20(3):534–539. doi: 10.1111/ene.12023

Table 1.

Demographic and clinical characteristics of sequenced and genotyped subjects

	ET cases (N = 259)	Controls (N = 262)	Statistical test	P-value
ET diagnosis: definite/probable/possible	75/120/64	0	Not applicable	Not applicable
% male (N)	52.5 (136)	43.1 (113)	χ² = 4.6	0.03
Mean age at tremor onset (years) (SD)	43.0 (23.1)	Not applicable	Not applicable	Not applicable
Mean years of education (SD)	15.3 (3.8)	15.6 (3.3)	Unpaired t-test	0.34
% with family history of ET (N)^**	35.1 (91)	1.1 (3)	χ² = 101.9	<0.0001
% Ashkenazi Jewish ancestry (N)^*	36.7 (95)	22.9 (60)	χ² = 11.8	0.008

ET, essential tremor.

^**

P < 0.0001;

P < 0.05.