Table 1.

Data from three studies of essential tremor

	Population-based study in Turkey	Population-based study in New York	Clinical sample in New York
Total number of ET cases	89	106	388
Age	57.3 ± 11.6 yrs	69.8 ± 18.4 yrs	67.4 ± 15.3 yrs
Gender	42 (47.2%) women	63 (59.4%) women	200 (51.5%) women
ET cases with head tremor	16 (18.0% of 89)	19 (17.9% of 106)	144 (37.1% of 388)
Age	64.3 ± 11.3 yrs	69.6 ± 20.0 yrs	71.9 ± 12.1 yrs
Gender	10 (62.5%) women	14 (73.7%) women	101 (70.1%) women
ET cases with head tremor and no voice or jaw tremor	11 (12.3% of 89)	13 (12.3% of 106)	82 (21.1% of 388)
Age	65.7 ± 12.3 yrs	65.4 ± 22.2 yrs	70.2 ± 12.8 yrs
Gender	6 (54.5%) women	11 (84.6%) women	58 (70.7%) women
ET cases with head tremor, no voice or jaw tremor, and no arm tremor of moderate or greater amplitude during at least one of 12 tests	2 (2.3% of 89)	2 (1.9% of 106)	12 (3.1% of 388)
Age	52.5 ± 0.7 yrs	56.5 ± 26.2 yrs	63.3 ± 14.6 yrs
Gender	1 (50.0%) woman	2 (100%) women	11 (91.7%) women
ET cases with head tremor and no voice or arm tremor	0 (0% of 89)	0 (0% of 106)	0 (0% of 388)

In each cell, the number of cases (percentage of total cases) is provided, as well as their mean ± SD age and gender distribution.