Table 5 The mean distance of different motor symptom improvement rate groups in the MNI space from the active contacts to the STN subregion [M (IQR), mm]

Improvement rates < 25% group

5

0.2 (1.2)

1.4 (1.1)

1.5 (1.5)

0.4 (1.2)

1.7 (1.4)

0.4 (1.0)

Improvement rates 25–50% group

11

0.1 (1.4)

0.7 (1.4)

1.9 (0.9)

0.1 (0.6)

0.6 (1.2)

0.5 (0.8)

Improvement rates > 50% group

41

0.1 (0.4)

0.8 (1.2)

0.9 (1.1)

0.2 (0.5)

1.1 (1.1)

0.9 (1.5)

Kruskal-Wallisχ²

0.251

1.693

0.255

2.200

4.158

2.908

P

0.882

0.429

0.881

0.333

0.128

0.234