Table 3.
Age-specific prevalence of dementia and Alzheimer’s disease, and overall standardized prevalence: African-American sample, Indianapolis, Indiana
| Age group (years) | 1992 |
2001 |
||||||
|---|---|---|---|---|---|---|---|---|
| With dementia |
With AD |
With dementia |
With AD |
|||||
| Prevalence (%) |
95% CI | Prevalence (%) |
95% CI | Prevalence (%) |
95% CI | Prevalence (%) |
95% CI | |
| 70 to 74 | 2.5 | 1.6–3.4 | 1.7 | 0.9–2.4 | 1.9 | 0.9–2.9 | 1.3 | 0.4–2.2 |
| 75 to 79 | 4.9 | 3.5–6.2 | 3.5 | 2.3–4.8 | 4.7 | 2.2–7.2 | 4.0 | 1.6–6.4 |
| 80 to 85 | 9.7 | 7.3–12.1 | 7.8 | 5.5–10.1 | 10.3 | 3.6–16.9 | 9.4 | 2.4–16.4 |
| 85+ | 17.5 | 12.8–22.2 | 15.8 | 11.0–20.6 | 23.2 | 4.7–41.6 | 22.5 | 4.6–40.4 |
| Overall standardized prevalence* |
6.8 | 5.8–7.7 | 5.5 | 4.5–6.4 | 7.5 | 4.3–10.6 | 6.8 | 3.7–9.9 |
Abbreviations: 95% CI, 95% confidence interval; AD, Alzheimer’s disease.
*
Direct standardization by age for subjects age ≥70 years using 1990 US Census data for African-Americans in Indianapolis, Indiana.