Clinical and demographical characteristics of the patients included in the study, at the time of scanning.

M, male; F, female; SD, standard deviation; ETRS, essential tremor rating scale; aChange in total score of item 5 of the ETRS with respect to preoperative score (negative indicates improvement); bItems 5 and 6 of the ETRS scored only with arms stretched, similarly to the scanning task; P, proximal; D, distal; EMG, electromyography, L, Left; R, right; EF, extensor of the finger; FDI, first dorsal interosseus; ECR, extensor carpi radialis; FCR, flexor carpi radialis; na, not available.