Table 2 Lineal negative correlations between headache clinical parameters and cervical range of motion within children with chronic tension type headache

Cervical flexion

 r_s = −0.248; P = 0.089

r_s = −0.139; P = 0.345

r_s = −0.039; P = 0.792

Cervical extension

 r_s = −0.220; P = 0.133

r_s = −0.088; P = 0.554

r_s = −0.008; P = 0.554

Cervical right lateral-flexion

 r_s = −0.056; P = 0.705

r_s = −0.021; P = 0.886

r_s = −0.077; P = 0.603

Cervical left lateral-flexion

 r_s = −0.089; P = 0.545

r_s = −0.090; P = 0.542

r_s = −0.102; P = 0.492

Cervical right rotation

 r_s = −0.143; P = 0.331

r_s = −0.012; P = 0.935

r_s = −0.183; P = 0.214

Cervical left rotation

 r_s = −0.019; P = 0.898

r_s = −0.099; P = 0.502

r_s = −0.031; P = 0.835