Table 2.

Summary of the cardiac- and respiratory-driven CSF displacements (cm) in the cranial and caudal directions for the three different respiratory periods

Respiratory period (s)	Cranial		Caudal
	Cardiac	Respiratory	Cardiac	Respiratory
Sylvian aqueduct
6	0.051 ± 0.022	0.124 ± 0.023	−0.049 ± 0.019	−0.121 ± 0.024
10	0.054 ± 0.027	0.138 ± 0.043	−0.052 ± 0.023	−0.140 ± 0.052
16	0.054 ± 0.025	0.147 ± 0.054	−0.053 ± 0.024	−0.156 ± 0.058
Foramen magnum
6	0.319 ± 0.154	0.505 ± 0.314	−0.313 ± 0.147	−0.489 ± 0.325
10	0.334 ± 0.169	0.614 ± 0.355	−0.331 ± 0.169	−0.670 ± 0.362
16	0.308 ± 0.133	0.501 ± 0.281	−0.308 ± 0.132	−0.572 ± 0.424

Displacement (cm) in the aqueduct and foramen magnum

Values are shown as mean ± standard deviation