Table 1.
Demographic Characteristics and Descriptive Statistics for Raw Cognitive Variables at Baseline
| Demographic variables | Cognitively normal sample (n = 2,608) |
Dementia prediction sample (n = 642) |
MCI prediction sample (n = 437) |
|---|---|---|---|
| Age: M (SD) | 69.69 (7.88) | 71.75 (7.61) | 71.54 (7.56) |
| Education: M (SD) | 16.36 (2.54) | 16.47 (2.67) | 16.48 (2.59) |
| % Female | 64.70% | 51.10% | 56.50% |
| Racial breakdown | |||
| White | 77.50% | 80.20% | 76.70% |
| Black/African American | 18.10% | 15.30% | 17.40% |
| American Indian/Alaska Native | 1.30% | 1.60% | 2.10% |
| Asian | 2.00% | 2.30% | 3.00% |
| Unknown/other | 0.70% | 0.60% | 1.00% |
| Ethnic breakdown | |||
| Hispanic | 3.90% | 1.50% | 3.90% |
| Non-Hispanic | 95.90% | 98.00% | 95.90% |
| Cognitive variables | M (SD) | M (SD) | M (SD) |
| Benson Figure Copy | 15.50 (1.37) | 17.44 (12.38) | 17.51 (12.22) |
| Benson Figure Recall | 11.24 (2.98) | 12.14 (13.64) | 13.22 (13.14) |
| Trailmaking Test part A | 32.33 (13.21) | 56.42 (141.63) | 54.85 (144.99) |
| Trailmaking Test part B | 86.06 (45.12) | 122.69 (165.57) | 108.12 (149.21) |
| Letter fluency | 27.50 (8.37) | 28.85 (14.42) | 30.08 (13.59) |
| Number Span Forward | 8.22 (2.32) | 10.29 (14.07) | 10.41 (14.13) |
| Number Span Backward | 6.94 (2.22) | 8.95 (14.28) | 9.24 (14.31) |
| Vegetable Naming | 14.63 (4.07) | 15.41 (12.93) | 16.54 (12.95) |
| Animal Naming | 21.13 (5.66) | 21.40 (11.59) | 22.86 (11.57) |
| Multilingual Naming Test | 29.94 (2.31) | 31.41 (11.13) | 31.75 (10.65) |
| Craft Story Immediate Recall | 21.40 (6.45) | 21.10 (13.32) | 22.78 (13.00) |
| Craft Story Delayed Recall | 18.52 (6.72) | 18.03 (13.87) | 19.93 (13.40) |
Note. MCI = mild cognitive impairment.