Table 1.

Demographic and clinical characteristics of all subjects.

Variables	ET patients	HCs
Total Numbers	218	315
Gender, Male/Female (%)	113/105(51.8/48.2)	168/147(53.3/46.7)
Family history, Positive/Negative	157/61	—
Age at examination (years)	46.73 ± 17.04	36.87 ± 10.46
Age at onset (years)	36.23 ± 15.93	—
EOET/LOET	118/100(54.1/45.9)	—

Age in the table were presented in mean and standard deviation (SD). We chose the onset age of 40 years as the cut-point to define EOET and LOET. Abbreviations: ET: Essential tremor; HCs: health controls; EOET: early onset Essential tremor; LOET: late onset Essential tremor.