Table 1. Demographic characteristics.
| Variable | Categories | Pooled Sample N=6097 | MCI N=3456 | Mild AD N=2641 | Mild AD vs. MCI p-value |
|---|---|---|---|---|---|
| Age, yr | 75.7 (8.7) | 75.4 (8.7) | 76.0 (8.8) | .0034 | |
| Gender, N (%) | Male | 2784 (46%) | 1598 (46%) | 1186 (45%) | .30 |
| Female | 3313(54%) | 1858 (54%) | 1455 (55%) | ||
| Education, yr | <12 | 561(9%) | 327 (9%) | 234(9%) | <.0009 |
| 12-16 | 3834 (63%) | 2105 (61%) | 1729 (65%) | ||
| >16 | 1702 (28%) | 1024 (30%) | 678 (26%) | ||
| Race | White | 4960(81%) | 2706(78%) | 2254(85%) | <.0001 |
| African American | 825 (14%) | 559 (16%) | 266 (10%) | ||
| Asian | 117 (2%) | 79 (2%) | 38 (1%) | ||
| Other | 195 (3%) | 112 (3%) | 83 (3%) | ||
| Married | Yes | 3876(63%) | 2101 (61%) | 1775 (66%) | <.0001 |
| No | 2221 (37%) | 1355 (39%) | 866 (34%) | ||
| Parental history of dementia | Yes | 2814 (52%) | 1555 (45%) | 1259 (48%) | .017 |
| No | 3165 (46%) | 1844 (54%) | 1321 (50%) | ||
| Unknown | 91 (2%) | 44 (1%) | 48 (2%) | ||
| Missing | 27 (<0.5%) | 13 (<0.5%) | 14 (<0.5%) | ||
| Second-degree relative history of dementia | Yes | 1486(24%) | 871 (25%) | 615 (23%) | .142 |
| No | 3424 (56%) | 1936 (56%) | 1488 (57%) | ||
| Unknown | 1160 (19%) | 636 (19%) | 524 (20%) | ||
| Missing | 27 (<0.5%) | 13 (<0.5%) | 14 (<0.5%) | ||
| MMSE | 25.7 (2.9) | 27.1 (2.3) | 23.9 (2.6) | <.0001 | |
| FAQ | 7.1 (7.2) | 3.3 (4.5) | 12.0 (7.2) | <.0001 |