Table 2 Comparison of characteristics between the higher and lower MI groups.

From: Pretreatment brain volumes can affect the effectiveness of deep brain stimulation in Parkinson's disease patients

  Higher MI group (n = 39) Lower MI group (n = 42) p
Age (years, mean ± standard deviation) 59.05 ± 8.83 58.95 ± 8.97 0.960
Percentage of male 59% (23) 40% (17) 0.098
Disease duration 9.85 ± 3.93 10.05 ± 5.16 0.845
Preoperative medication off 48.86 ± 12.99 51.33 ± 14.86 0.429
Preoperative medication on 13.08 ± 8.68 16.18 ± 10.69 0.157
Postoperative medication off stimulation on 4.2 ± 3.59 26.56 ± 16.93 0.000
Postoperative medication off stimulation off 30.53 ± 14.76 39.49 ± 19.42 0.023
Changes of UPDRS (dUPDRS) 87.08 ± 9.51 32.55 ± 25.83 0.000
Lead distancea, right (mm) 2.08 ± 1.11 2.17 ± 1.00 0.726
Lead distancea, left (mm) 2.06 ± 1.06 2.36 ± 1.16 0.229
  1. Values reported as mean ± standard deviation.
  2. MI,  motor improvement.
  3. aThe shortest distance between targeted coordinates and the measured coordinates of the active contact.