Table 1. Descriptive statistics.
| Variable | N | Mean (SD) |
|---|---|---|
| Age (observed) | 3381 | 70.88 (9.48) |
| APOE e4 alleles (1 = e4+, n = 1223) | 3154 | 0.39 (0.49) |
| CDR (Sum of Boxes) | 3306 | 2.42 (3.35) |
| COWA | 3381 | 8.41 (3.49) |
| DIS | 3381 | 8.89 (3.01) |
| EDUC (observed) | 3381 | 13.24 (4.25) |
| Ethnicity (1 = MA, n = 1189) | 3381 | 0.36 (0.47) |
| GDS30 (observed) | 3005 | 5.60 (5.25) |
| Gender (♂ = 1, n = 1281) | 3312 | 0.39 (0.49) |
| IADL (Summed) | 3381 | 10.48 (4.52) |
| MMSE | 3311 | 25.52 (4.76) |
| WMS LM II | 3381 | 8.05 (4.30) |
| WMS VR I | 3381 | 7.88 (3.68) |
| Complete Cases | 2861 |
CDR = Clinical Dementia Rating scale; COWA = Controlled Oral Word Association Test; DIS = Digit Span Test; GDS = Geriatric Depression Scale; IADL = Instrumental Activities of Daily Living; MMSE = = Mini-mental State Exam (Folstein, Folstein & McHugh, 1975); SD = standard deviation; WMS LM II = Weschler Memory Scale: Delayed Logical Memory; WMS VR I = Weschler Memory Scale: Immediate Visual Reproduction.