From: Effect of different surgical methods on headache associated with cervical spondylotic myelopathy and/or radiculopathy
C3/4
C4/5
C5/6
C6/7
Total
20
46
89
26
Headache
6
13
27
12
VAS change
1.3 ± 1.6
3.1 ± 2.2
4.2 ± 2.9
2.7 ± 4.0