Table 2.

Number with known dementia status and dementia prevalence

	CFAS I		CFAS II*
	N	% (95% CI)	N	% (95% CI)
Men
65–69 years	145	1·7% (0·8–3·2)	968	1·2% (0·6–2·3)
70–74 years	146	2·2% (1·2–4·0)	903	3·0% (2·0–4·4)
75–79 years	107	5·7% (3·4–9·2)	756	5·2% (3·8–7·0)
80–84 years	74	14·6% (8·6–23·7)	540	10·6% (8·2–13·7)
85–89 years	48	19·8% (10·3–34·6)	273	12·8% (9·0–18·0)
≥90 years	11	68·2% (34·8–89·6)	85	17·1% (10·6–26·4)
Women
65–69 years	165	2·0% (1·0–3·8)	971	1·8% (0·9–3·6)
70–74 years	174	2·9% (1·7–5·0)	971	2·5% (1·6–3·9)
75–79 years	156	7·4% (3·7–14·6)	866	6·2% (4·5–8·4)
80–84 years	217	13·9% (9·7–19·4)	736	9·5% (7·3–12·3)
85–89 years	138	26·5% (18·1–37·1)	434	18·1% (14·5–22·2)
≥90 years	76	32·3% (21·7–45·0)	217	35·0% (28·4–42·3)
By sex, standardised to 2011 UK age structure
Men	..	7·4% (5·7–9·1)	..	4·9% (4·2–5·7)
Women	..	9·4% (7·6–11·2)	..	7·7% (6·8–8·5)
Total	..	8·3% (7·0–9·6)	..	6·5% (5·9–7·0)
By area, standardised to 2011 UK age structure
Cambridgeshire	..	6·7% (5·0–8·4)	..	6·1% (5·1–7·1)
Newcastle	..	8·3% (6·3–10·2)	..	7·2% (6·2–8·3)
Nottingham	..	10·2% (7·4–13·0)	..	6·0% (5·0–6·9)

^*76 individuals in CFAS II had unknown dementia status.