Table 1.
Descriptive Statistics
| Variable | N | Mean (SD) |
|---|---|---|
| Age (observed) | 3,381 | 70.88 (9.48) |
| Boston (observed) | 3,228 | 7.88 (4.26) |
| CDR (sum of boxes) | 3,306 | 2.42 (3.35) |
| COWA | 3,381 | 8.41 (3.49) |
| DIS | 3,381 | 8.89 (3.01) |
| EDUC (observed) | 3,381 | 13.24 (4.25) |
| Ethnicity (1 = MA, n = 1,189) | 3,381 | 0.36 (0.47) |
| GDS30 (observed) | 3,005 | 5.60 (5.25) |
| Gender (♂ = 1, n = 1,281) | 3,312 | 0.39 (0.49) |
| IADL (summed) | 3,381 | 10.48 (4.52) |
| MMSE (observed) | 3,311 | 25.52 (4.76) |
| Trails A (observed) | 3,106 | 8.25 (3.74) |
| Trails B (observed) | 2,807 | 7.95 (3.82) |
| Complete cases | 2,861 |
Note: CDR = Clinical Dementia Rating scale; COWA = Controlled Oral Word Association Test; DIS = Digit Span Test; GDS = Geriatric Depression Scale (24); IADL = Instrumental Activities of Daily Living; MMSE = Mini-mental State Exam (25); SD = standard deviation; Trails A = Trail-Making Test part A; Trails B = Trail-Making Test part B.