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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: Alzheimers Dement. 2015 Jul 26;12(3):244–251. doi: 10.1016/j.jalz.2015.06.1894

Table 4.

Estimated annual incidence rates of Alzheimer’s disease with 95% confidence intervals (CI) for African Americans and Yoruba

1992 Cohort 2001 Cohort


Study
Population
Age Group Predicted
Cases
Person-year Rate (%) 95% CI Predicted
Cases
Person-year Rate (%) 95% CI
African Americans 70–74 30 1705 1.8 1.2 2.5 10 2220 0.5* 0.2 0.8
75–79 46 2194 2.1 1.6 2.8 27 2907 0.9* 0.6 1.4
80–84 50 1699 3.0 2.2 3.9 27 1634 1.7 1.1 2.4
85+ 63 1340 4.7 3.6 6.0 32 926 3.4 2.3 4.8
Overall^ -- -- 2.5 2.1 2.9 -- -- 1.3* 1.0 1.5
Yoruba 70–74 14 1748 0.8 0.5 1.4 17 3574 0.5 0.3 0.8
75–79 22 1699 1.3 0.8 2.0 24 3315 0.7 0.5 1.1
80–84 27 1404 1.9 1.3 2.8 18 1162 1.5 0.9 2.4
85+ 40 1307 3.1 2.2 4.2 15 661 2.3 1.3 3.7
Overall^ -- -- 1.5 1.2 1.8 -- -- 1.0 0.7 1.2
*

denotes significant difference in rates between the 1992 and 2001 African American cohorts.

^

Overall rates were standardized using the age distribution of 1990 United States census data for African Americans in Marion County.