Table 2.

Sensitivity of question on self-reported head tremor

	Population-Based Study in Northern Manhattan [8,11,12]	Study of the Environmental Epidemiology of ET [9]	Family Study of Essential Tremor [13,14]	Essential Tremor Centralized Brain Repository [5,15]
All cases*	6/19, 31.6% (15.4%–54.0%)	89/143, 62.2% (54.1%–69.8%)	34/60, 56.7% (44.1%–68.4%)	43/92, 46.7% (36.9%–56.9%)
≤ median age	2/9, 22.2%	37/52, 71.2%	13/23, 56.5%	22/48, 45.8%
> median age	4/10, 40.0%	52/91, 57.1%	21/37, 56.8%	21/44, 47.7%
Male	0/5, 0.0%	24/43, 55.8%	12/25, 48.0%	8/24, 33.3%
Female	6/14, 42.9%	65/100, 65.0%	22/35, 62.9%	35/68, 51.5%
≤ median education	Information not	50/74, 67.6%	15/22, 68.2%	27/45, 60.0%
> median education	available	39/68, 57.4%	19/38, 50.0%	15/46, 32.6%
< median TTS	4/11, 36.4%	36/55, 65.5%	11/24, 45.8%	15/38, 39.5%
≥ median TTS	2/8, 25.0%	53/85, 62.4%	23/36, 63.9%	27/53, 50.9%
≤ median duration	1/5, 20.0%	34/63, 54.0%	8/22, 36.4%	13/43, 30.2%
> median duration	5/8, 62.5%	55/79, 69.6%	25/37, 67.6%	30/48, 62.5%
+ ET medication	2/3, 66.7%	48/78, 61.5%	21/31, 67.7%	34/73 = 46.6%
− ET medication	4/16, 25.0%	41/65 63.1%	13/29, 44.8%	9/19 = 47.4%
+ Family history	All cases had a family	30/44, 68.2%	All cases had a	34/72, 47.2%
− Family history	history of ET	56/94, 59.6%	family history of ET	9/20, 45.0%
Voice tremor (exam)	2/5, 40.0%	42/61, 68.9%	13/17, 76.5%	28/52, 53.9%
No voice tremor	4/13, 30.8%	44/79, 55.7%	21/43, 48.8%	15/38, 39.5%

^*Values are number with self-reported head tremor/number with head tremor on examination, prevalence per 100 (95% confidence interval).

TTS = total tremor score.

Some data points were missing for education, total tremor score, tremor duration, family history of ET, and voice tremor on examination.