Table 1. Demographic characteristics of the three patient groups.

	INPH	OD	Controls
	Group 1	Group 2	Group 3
Number of cases (female/male)	18 (10/8)	11 (5/6)	20 (10/10)
Mean age, years (range)	66 (50–75)	64 (45–79)	53 (40–75)

INPH, idiopathic normaly-pressure hydrocephalus; OD, other dementias.