Table 1.

Demographic and clinical characteristics of control subjects

	Study in New York	Study in Turkey
N	406	89
Age in years	67.8 ± 12.5 (18 – 94)	57.2 ± 11.6 (40 – 83)
Female gender	240 (59.1%)	42 (47.3%)
Total tremor score (range = 0 – 36)	3.84 ± 2.89 (0 – 15)	1.32 ± 2.78 (0 – 12)
Answered yes to the question: “Do you often have shaking that you can’t control?”	11 (2.7%)	5 (5.6%)
Does anyone in your family have ET?
No	362 (89.2%)	82 (92.1%)
Yes, First-Degree	30 (7.4%)	7 (7.9%)
Yes, Second-Degree	13 (3.2%)	0 (0.0%)
Yes, Third-Degree	1 (0.2%)	0 (0.0%)
Does anyone in your family have PD?
No	388 (95.6%)	89 (100%)
Yes, First-Degree	10 (2.5%)	0 (0%)
Yes, Second-Degree	7 (1.7%)	0 (0%)
Yes, Third-Degree	1 (0.2%)	0 (0%)

All values are mean ± SD (range) or numbers (%).