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Table 1
Characteristics of participants, by race, in the analyses of cognitive level, cognitive decline, and incident dementia.
| Black participants | White participants | Difference,ref: white (95% CIa) |
|---|
| Analyses of cognitive level and cognitive decline |
| N=4968 | N=2767 | |
 Mean age, years, at baseline (SDa) | 71 (6) | 74 (7) | −3.0 (−3.3, −2.7) |
| Male (%) | 37 | 38 | −1 (−3, 2) |
| Mean years of formal education (SD) | 12 (3) | 14 (3) | −2.4 (−2.6, −2.3) |
| Composite childhood socioeconomic resources score (SD)b | −0.1 (0.7) | 0.3 (0.7) | −0.44 (−0.47, −0.41) |
| APOE ε4 allele carrierc (%) | 37 | 26 | 11 (8, 14) |
| Mean baseline global cognitive score (SD) | −0.2 (1.0) | 0.4 (0.9) | −0.59 (−0.63, −0.55) |
| Mean 5-year change in global cognitive score (SD) | −0.25 (0.63) | −0.26 (0.68) | 0.01 (−0.02, 0.04) |
| Analyses of incident dementia |
| N=1170 | N=974 | |
| Mean age, years, at baseline (SD) | 72 (5) | 75 (6) | −3.0 (−3.6, −2.6) |
| Male (%) | 37 | 39 | −2 (−6, 2) |
| Mean years of formal education (SD) | 12 (3) | 14 (3) | −2.4 (−2.6, −2.1) |
| Composite childhood socioeconomic resources score (SD)b | −0.1 (1.1) | 0.5 (1.1) | −0.5 (−0.6, −0.4) |
| APOE ε4 allele carrierc (%) | 35 | 26 | 9 (5, 13) |
| Incident ADa case (%)d | 24 | 17 | 6 (3, 10) |
| Incident dementia case (%)d | 25 | 18 | 7 (3, 10) |