Figure 2 Motor examination score (UPDRS part III, mean±SD) in the off‐medication and on‐medication conditions before (n = 97) and 3 (double blind evaluation) and 12 months after surgery (n = 95). White bars: off medication and off stimulation; black bars: on medication and off stimulation; light grey bars: off medication and on stimulation; dark grey bars: on medication and on stimulation. *p<0.0001 for the comparison with the off medication and off stimulation condition at the same time of follow up; †p<0.0001 for the comparison with the preoperative off‐medication score.