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Table 1 Characteristics of African Americans from the GENOA study with cognitive and DNA methylation dataa
| Full analysis sampleb | Subset samplec | ||
|---|---|---|---|
| (N = 289) | (N = 247) | ||
| Age (years) | 67.2 (7.1) | 67.4 (6.8) | |
| Sex (female) | 207 (72%) | 183 (74%) | |
| Education | Less than high school degree | 95 (33%) | 83 (34%) |
| High school degree / GED | 81 (28%) | 68 (27%) | |
| Beyond high school degree | 113 (39%) | 96 (39%) | |
| Body mass index (BMI, kg/m2) | 30.9 (6.0) | 30.9 (6.1) | |
| Current smoker | 34 (12%) | 29 (12%) | |
| Diabetes | 85 (29%) | 70 (28%) | |
| Hypertension | 241 (83%) | 205 (83%) | |
| White matter hyperintensity (WMH, cm3) | 12.0 (14.2) | 11.9 (13.6) | |
| APOE ε4 carrier | N/A | 102 (41%) | |
| APOE ε2 carrier | N/A | 60 (24%) | |
| Processing speed (DSST, symbols)d | 30.6 (13.2) | 30.4 (13.2) | |
| Category fluency (Animal Naming, words)d | 14.2 (4.4) | 14.0 (4.2) | |
| Letter fluency (FAS, words)d | 28.2 (11.5) | 28.1 (11.5) | |
| Learning (RAVLT, words)d | 38. 5 (9.7) | 38.5 (9.5) | |
| Delayed recall (RAVLT, words)d | 6.1 (3.6) | 6.2 (3.6) | |
| Concentration effectiveness (SCWT, items)d | 20.5 (9.1) | 20.4 (8.9) | |
| Global cognitive function | − 0.12 (0.95) | − 0.17 (0.94) | |
