Table 1.

Basic demographics and cerebellar oscillations for controls and essential tremor cases

	Control	Essential tremor	p value
n	20	40
Age	67.1 ± 9.3	66.8 ± 14.8	0.940a
Female gender	50% (10)	40% (16)	0.461b
Family history of tremor*	0% (0)	55% (22)	< 0.001b
Tremor onset age	NA	44.4 ± 19.8	—
Tremor duration (y)	NA	22.0 ± 15.4	—
Total tremor score	0.1 ± 0.2 Median = 0.0	20.2 ± 9.0 Median = 18.5	< 0.001c
Cerebellar oscillation index	6.8 ± 2.9 Median = 6.8	12.4 ± 6.6 Median = 10.3	< 0.001c

^aIndependent t test

^bChi-squared test

^cMann–Whitney test

^*With liberal criteria

The median is reported if one or more of the variables are not normally distributed