Table 1:
Sociodemographic characteristics by study sample and race
| WHICAP | HRS | |||||
|---|---|---|---|---|---|---|
| African American | White | p-value | African American | White | p-value | |
| N | 1013 | 540 | 2362 | 13313 | ||
| No. of states | 32 | 34 | -- | 43 | 51 | -- |
| Age, mean (range) | 77 (66, 102) | 76 (66, 102) | <0.01 | 67 (50, 107) | 68 (49,103) | <0.01 |
| Born in the South (%) | 54 | 4 | <0.01 | 77 | 30 | <0.01 |
| Male (%) | 27 | 42 | <0.01 | 38 | 44 | <0.01 |
| Years of schooling, mean (SD) | 12 (3) | 14 (3) | <0.01 | 11 (4) | 13 (3) | <0.01 |
| Words, mean (SD) | -- | -- | -- | 8.6 (3.8) | 10.2 (3.7) | <0.01 |
| Cognitve, mean (SD) | -- | -- | -- | 9.0 (2.8) | 11.2 (2.0) | <0.01 |
| Vocabulary, mean (SD) | 0.3 (0.6) | 0.8 (0.5) | <0.01 | 3.9 (2.3) | 5.8 (1.9) | <0.01 |
| Memory, mean (SD) | 0.1 (0.8) | 0.6 (0.7) | <0.01 | -- | -- | -- |
| Speed, mean (SD) | 0.3 (0.9) | 0.8 (0.7) | <0.01 | -- | -- | -- |
| Visio-spatial, mean (SD) | 0.3 (0.5) | 0.7 (0.4) | <0.01 | -- | -- | -- |