Table 1.

Prevalence of dementia: community-based studies 1994–2000 (Lopes et al., 2007).

Age	Number of studies	Prevalence of dementia (%) (CI** 95%)	Average increase in prevalence
65–69	17	1.2 (0.8–1.5)	—
70–74	19	3.7 (2.6–4.7)	3.0
75–79	21	7.9 (6.2–9.5)	2.1
80–84	20	16.4 (13.8–18.9)	2.0
85–89	16	24.6 (20.5–28.6)	1.5
90–94	6	39.9 (34.4–45.3)	1.6
>95	6	54.8 (45.6–63.9)	1.3

**CI, confidence interval.