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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Parkinsonism Relat Disord. 2014 Feb 7;20(5):541–544. doi: 10.1016/j.parkreldis.2014.01.021

Table 1.

Demographic and Clinical Characteristics of 120 ET cases vs. 15 Dystonia Cases

Characteristic ET Cases

(N = 120)		 Dystonia
Cases
(N = 15)		 Significance
Age (years) 58.4 ± 17.5 65.5 ± 10 t = 2.31, p = 0.03
Female gender 61 (50.8) 14 (93.3) X2 = 9.75, p = 0.002
White race 108 (90.0) 12 (80.0) X2 = 1.35, p = 0.38
Age of tremor onset (years) 26.9 ± 18.8
[median = 20]		 37.5 ± 21.4
[median = 40]		 Mann-Whitney =
1.83, p = 0.07
Duration of tremor (years) 31.6 ± 19.3
[median = 31]		 26.5 ± 17.5
[median = 24]		 Mann-Whitney =
0.75, p = 0.45
Voice tremor on examination 17 (14.3) 2 (14.3) X2 = 0.00, p = 1.0
Cranial tremor on examination 55 (45.8) 4 (26.7) X2 = 1.99, p = 0.18
Total Tremor Score 18.9 ± 6 16.8 ± 6 t = 1.23, p = 0.22
Spiral Axis Score 2.03 ± 1.31
[median = 2]		 1.20 ± 1.37
[median = 1]		 Mann-Whitney =
2.23, p = 0.03
Spiral Axis Score

 0
 1
 2
 3
 4

19 (15.8)
20 (16.7)
42 (35.0)
16 (13.3)
23 (19.2)

7 (46.7)
2 (13.3)
3 (20.0)
2 (13.3)
1 (6.7)
X2 = 8.75, p = 0.068

Values are means ± standard deviations [medians] or numbers (percentages).