Table 3. Characteristics of African American, Ibadan, Puerto Rican, and non-Hispanic White data sets.
| Characteristic | African American | Ibadan | Puerto Rican | non-Hispanic White |
|---|---|---|---|---|
| Individuals, No. | ||||
| Cases | 1850 | 63 | 273 | 8463 |
| Controls | 4331 | 648 | 275 | 11365 |
| Women, No. (%) | ||||
| Cases | 1290 (69.7) | 52 (82.5) | 181 (66.3) | 4710 (55.7) |
| Controls | 3120 (72.0) | 401 (61.9) | 213 (77.5) | 6678 (58.8) |
| Age, mean (SD) | ||||
| Casesa | 78.6(8.1) | 83.5(5.2) | 76.5(8.3) | 75.9(6.9) |
| Controlsb | 75.9(8.4) | 81.1(4.5) | 75.4(6.5) | 77.5(7.3) |
| ApoE ε4 frequencies, No. (%) | ||||
| -/- c | 3553 (57.5) | 432 (60.8) | 383 (69.9) | 12218 (61.6) |
| -/ ε4 | 2280 (36.9) | 246 (34.6) | 144 (26.3) | 6627 (33.4) |
| ε4/ ε4 | 348 (5.6) | 33 (4.6) | 23 (3.8) | 983 (5.0) |
a Age on onset
b Age at last evaluation
c Containing genotypes ε2/ ε2, ε2/ ε3 and ε3/ ε3