Am I missing something? If I understand the report on the paper correctly, it contains a curious mixture of data.

E.g. "a significant reduction in total levodopa equivalent daily doses (mg/day) of 50.45% was observed in patients treated with STN-DBS". Although, everything else being equal, this is desirable, it is not the same thing as a 50.45% reduction in symptoms.

E.g. "Most patients reported that expectations of improvement after DBS were met, namely 64% for motor symptoms, 71% for quality of life, and 83% for reductions in daily medication dose." I take this to mean that if I went into the procedure with the expectation that, for some measure, I would get an improvement of 10%, say, and I got this, then I could write that 100% of my expectations in that measure had been met.

John