Table 3.

Rate of progression to AD per 100 person-years (95% CI) according to age, education, ethnicity, and gender among elders with and without MCI at baseline

	Total N	person- years	# of incident AD cases	rate per 100 person-years(95% CI)
No MCI	1800	8224.1	186	2.3% (1.9–2.6)
Age 65–69	261	1359.1	3	0.2% (0.0–0.4)
Age 70–74	588	2921.1	37	1.3% (0.9–1.7)
Age 75–79	478	2178.6	53	2.4% (1.8–3.1)
Age 80+	473	1765.3	93	5.3% (4.2–6.3)
MCI with memory impairment	318	875.5	65	7.4% (5.7–9.2)
Age 65–69	26	126.2	4	3.2% (0.1–6.2)
Age 70–74	73	286.6	13	4.5% (2.1–6.9)
Age 75–79	70	227.9	22	9.7% (5.8–13.5)
Age 80+	77	234.7	26	11.1% (7.1–15.1)
MCI without memory impairment	246	1417.9	58	4.1% (3.1–5.10)
Age 65–69	47	225.0	5	2.2% (0.3–4.2)
Age 70–74	91	417.3	12	2.9% (1.3–4.5)
Age 75–79	90	410.6	20	4.9% (2.8–7.0)
Age 80+	90	365.0	21	5.8% (3.4–8.1)