Table 2 Group characteristics of PD and ET patients.

From: Short pulse and directional thalamic deep brain stimulation have differential effects in parkinsonian and essential tremor

 

PD

ET

p

Age (years)

70.8 (± 10.42)

64.43 (± 9.91)

0.28

Disease duration (years)

6.33 (± 2.66)

35.57 (± 18.66)

0.0047

Time after surgery (days)

174.8 (± 102.68)

162.57 (± 52.55)

0.79

Interval pre-post-DBS examination (days)

455.83 (± 204.32)

344.71 (± 129.27)

0.26

Stereotactic coordinates (mm) Lowest “ventral” contact

x

11.25 (± 1.27)

10.65 (± 1.25)

0.35

y

8.51 (± 0.96)

8.14 (± 1.30)

0.55

z

− 3.71 (± 1.67)

− 4.17 (± 1.27)

0.52

Stereotactic coordinates (mm) 2nd lowest “dorsal” contact

x

11.92 (± 1.07)

11.56 (± 1.17)

0.57

y

7.01 (± 0.88)

6.65 (± 1.26)

0.58

z

− 1.91 (± 1.33)

− 2.09 (± 1.27)

0.80

Stimulation amplitude (mA) for induction of ataxia with 60 µs

3.58 (± 0.68)

3.19 (± 0.53)

0.06

  1. Significant values are in bold.
  2. “Disease duration” (years) is calculated from symptom onset to the study assessment. “Time after surgery” (days) is calculated from the date of surgery to the study assessment. “Interval pre-post-DBS examination” (days) is calculated from the date of the pre-operative evaluation to the study assessment. “Stereotactic coordinates” (mm) are the coordinates of the “ventral” lowest and “dorsal” 2nd lowest contacts with x = lateral to midline, y = posterior to mid-commissural point (MCP), z = above the plane between anterior and posterior commissure. “Stimulation amplitude” (mA) is the suprathreshold amplitude to induce ataxia with 60 µs pulse width in ring mode.
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