Table 1.

Baseline demographic and clinical characteristics of essential tremor cases

	ET cases enrolled in an epidemiological study (n=44)	ET cases enrolled in a brain donor programme (n=39)
Age (years)	66.8±14.7	82.1±4.6
Female gender	28 (63.6)	22 (56.4)
Education (years)	15.1±4.3	15.0±3.9
Family history of ET or tremor	30 (68.2)	29 (74.4)
Tremor duration (years)	26.3±17.8	41.0±22.2
Age of tremor onset (years)	40.1±20.2	41.0±23.5
Voice tremor on examination	13 (29.5)	17 (43.6)
Head (neck) tremor on examination	16 (36.4)	18 (46.2)
Jaw tremor on examination	6 (13.6)	13 (33.3)
Rest tremor on examination	4 (9.1)	18 (46.2)
Tremor Asymmetry Index	3.2±3.2	3.2±2.7
Takes daily ET medication	23 (52.3)	25 (64.1)
Takes ET medication only as needed	2 (4.5)	0 (0.0)
ET surgery	0 (0.0)	0 (0.0)

Values are mean±SD or number (%).

Family history included first- and second-degree relatives.

Tremor Asymmetry Index=|tremor score right arm − tremor score left arm|; range 0–18. ET, essential tremor.