The Efficacy and Predictors of Using GPi-DBS to Treat Early-Onset Dystonia: An Individual Patient Analysis

Table 4

Relationship between several factors and relative improvement (%) in BFMDRS.

Patient number	Follow-up period in 3 years		At the last follow-up
	Improvement (%) in BMFDRS-M ()	Improvement (%) in BMFDRS-D ()	Improvement (%) in BMFDRS-M ()	Improvement (%) in BMFDRS-D ()
Age at onset of symptoms (years)
	Age at surgery (years)
Disease duration (years)
	Follow-up period (months)
Preoperative BFMDRS-M score

Disease duration refers to the time from the onset to the operative treatment.