Table 1 Baseline characteristics and changing rates of the study participants
Variables | European Americans (N = 12090) | African Americans (N = 3100) |
|---|---|---|
Mean age (SD), years | 68.56 (11.61) | 62.99 (10.86) |
Female (%) | 6894 (57.0) | 1910 (61.6) |
Mean years of education (SD) | 13.26 (2.53) | 12.18 (2.89) |
Ever drinker, N (%) | 6388 (58.6) | 1399 (49.1) |
Ever smoker, N (%) | 6138 (56.6) | 1705 (60.1) |
Mean body mass index (SD), kg/m2 | 27.97 (5.87) | 30.28 (7.00) |
Mean physical activity index (SD) | 12.06 (4.30) | 11.20 (4.16) |
Mean baseline cognitive function (SD) | ||
Word recall | 10.04 (3.38) | 8.84 (3.25) |
Mental status | 12.90 (2.17) | 11.17 (2.75) |
Total cognitive function | 22.51 (4.70) | 19.80 (5.16) |
Mean annual changing rates (SD) | ||
Word recall | − 0.24 (0.20) | − 0.16 (0.18) |
Mental status | − 0.18 (0.14) | − 0.21 (0.21) |
Total cognitive function | − 0.57 (0.32) | − 0.56 (0.38) |
APOE genotypes, N (%) | ||
22 | 77 (0.6) | 35 (1.1) |
23 | 1551 (12.8) | 433 (14.0) |
24 | 253 (2.1) | 145 (4.7) |
33 | 7306 (60.4) | 1428 (46.1) |
34 | 2658 (22.0) | 926 (29.9) |
44 | 244 (2.0) | 133 (4.3) |