2.1.4. Comparisons

To characterize the explored range of stimulation parameters and the evolution of tremor outcomes from the first application of DBS for tremor (1987) until the present, we correlated these values with time, i.e., corresponding publication year. Next, we explored the relationship between voltage, pulse width, frequency and tremor control. We also documented the encountered side-e ffects and correlated their frequency with the corresponding stimulation parameters.

### *2.2. Experimental DBS Programming*
