Table 2

Comparison of volume parameters between each diagnostic group

	p Value
	VV	ICV	VV/ICV
The differences between groups were assessed by one way analysis of variance (VV: F=20.616, p<0.0001; ICV: F=14.390, p<0.0001; VV/ICV ratio: F=36.664, p<0.0001).
BA, brain atrophy; HV, healthy volunteer; ICV, intracranial CSF volume; INPH, idiopathic normal pressure hydrocephalus; SNPH, secondary normal pressure hydrocephalus; VV, ventricular volume.
INPH v SNPH	0.0055	<0.001	0.9928
INPH v BA	<0.001	0.9984	<0.001
INPH v HV	<0.001	<0.001	<0.001
SNPH v BA	0.9468	<0.001	<0.001
SNPH v HV	0.0055	0.9996	<0.001
BA v HV	0.0177	<0.001	0.0644