Table 3.

Ventriculomegaly defined by Evans index >0.3 and cognitive functions of idiopathic normal pressure hydrocephalus patients before and after shunt surgery

	EI >0.3	EI ≤0.3	P
Number of patients	52	28
Patient age (years)	78.0 (74.3-82.8)	78.5 (75.0-81.0)	0.857
EI	0.336 (0.320-0.354)	0.290 (0.276-0.295)	<0.0001
Pre-MMSE	20.0 (17.0-25.8)	21.5 (18.0-27.8)	0.255
Best-MMSE	26.0 (24.0-29.8)	25.5 (24.0-29.8)	0.914

Data are shown by the median (interquartile range). iNPH – Idiopathic normal pressure hydrocephalus; EI – Evans index; Pre-MMSE – Presurgical score of mini-mental state examination, Best-MMSE – Postsurgical best score of minimental state examination