Table 2.

A significant difference in mean values for cerebellar tonsillar region pulsations between CM-I patients and healthy controls was confirmed using an independent samples t-test [8, 27, 28]

Brain region	Mean ± SD of controls	Mean ± SD of CM-I	Difference in means
Cerebellar tonsillar (Sag)	0.28 ± 0.09, n = 31	0.59 ± 0.28, n = 75	0.31 [95% CI 0.23, 0.38]
Cerebellar tonsillar (Combined sag with axial of controls and compare it to sag only of CM-I)	0.31 ± 0.25, n = 41	0.59 ± 0.28, n = 75	0.28 [95% CI 0.17, 0.38]
Pontomedullary junction (Sag)	0.32 ± 0.12, n = 25	0.56 ± 0.29, n = 64	0.24 [95% CI 0.15, 0.32]
Cervicomedullary junction (Sag)	0.3 ± 0.11, n = 25	0.44 ± 0.22, n = 64	0.14 [95% CI 0.06, 0.21]
4th ventricle fastigium (Sag)	0.24 ± 0.1, n = 25	0.42 ± 0.28, n = 64	0.18 [95% CI 0.09, 0.26]
Obex (Sag)	0.26 ± 0.1, n = 25	0.4 ± 0.19, n = 64	0.14 [95% CI 0.07, 0.20]