Table 5.

Cognitive function of idiopathic normal pressure hydrocephalus patients dichotomized by fulfilling or not-fulfilling Japanese radiological diagnostic criteria

	Fulfilling Japanese radiological criteria	Not-fulfilling Japanese radiological criteria	P
Number of patients	24	56
Patient age (years)	78 (74.25-81.5)	79 (75-82.8)	0.522
Evans index	0.328 (0.319-0.342)	0.303 (0.289-0.340)	0.076
Pre-MMSE	20.5 (18-25.8)	20 (17-26.8)	0.784
Best-MMSE	27 (25-30)	25 (23-29)	0.0924

DESH – Disproportionately enlarged subarachnoid space hydrocephalus; EI – Evans index; iNPH – Idiopathic normal pressure hydrocephalus; Fulfilling Japanese radiological criteria – Combination of EI>0.3 and DESH; Notfulfilling Japanese radiological criteria – This includes three groups of EI >0.3 and non-DESH, EI≤ 0.3 and DESH, EI≤ 0.3 and non-DESH. Pre-MMSE – Presurgical score of mini-mental state examination, Best-MMSE – Post-surgical best score of mini-mental state examination