2.1.2. Data Extraction

From each relevant study, the following data were extracted: publication year, size of patient sample, DBS target, average stimulation voltage, pulse width and frequency, tremor reduction, scale of tremor measurement, follow-up moment and side-e ffects. Side-e ffects were categorized as paresthesia, gait and balance problems, ataxia, dysarthria and diplopia or visual disturbances.
