. Author manuscript; available in PMC: 2019 Apr 1.

Published in final edited form as: Cerebellum. 2018 Apr;17(2):165–172. doi: 10.1007/s12311-017-0891-4

Table 1.

Demographic and Clinical Comparison of ET Cases and Controls

Variable	ET Cases	Controls	Significance
N	45	35
Age in years	74.98 ± 6.16	73.26 ± 6.06	0.22^a
Male gender	26 (57.8)	10 (28.6)	0.009^b
Right handed	38 (84.4)	31 (88.6)	0.85^c
White race	43 (95.6)	32 (91.4)	0.65^c
Married	28 (62.2)	22 (62.9)	0.95^b
Education (years)	17.9 ± 3.7 [18.0]	18.2 ± 4.8 [17.5]	0.87^d
Current smoker	1 (2.2)	1 (2.9)	1.00^c
MoCA score	27.5 ± 2.3 [28.0]	28.2 ± 1.7 [28.0]	0.22^d
Number of prescription medications	3.5 ± 2.5 [3.0]	3.2 ± 2.9 [3.0]	0.40^d
Ethanol use <1 drink/week <1 drink/day 1 drink/day > 1 drink/day	21 (46.7) 14 (31.1) 3 (6.7) 7 (15.6)	20 (57.1) 6 (17.1) 5 (14.3) 4 (11.4)	0.34^b
Total tremor score	21.5 ± 4.1 [22.0]	5.6 ± 2.3 [5.0]	<0.001^d
Neck or jaw tremor	26 (57.8)	NA	NA
Age of tremor onset in years	41.5 ± 20.4 [47.5]	NA	NA
Tremor duration in years	34.0 ± 19.6 [30.0]	NA	NA
Prescribed medication for tremor at some point	29 (64.4)	NA	NA
Left dentate volume (c.c.)	1.37 ± 0.22	1.40 ± 0.21	0.42^a
Right dentate volume (c.c.)	1.47 ± 0.24	1.49 ± 0.21	0.69^a
Left dentate GABA concentration (i.u.)	1.68 ± 0.49	1.80 ± 0.53	0.69^a
Right dentate GABA concentration (i.u.)	2.01 ± 0.45	1.86 ± 0.53	0.53^a

All values represent mean ± standard deviation or number (percentage).

c.c. = cubic centimeters, i.u. = institutional units, MoCA = Montreal Cognitive Assessment.

Student’s t test

Chi-square test

Fisher’s exact test

Mann-Whitney test