Table 1.
Characteristics of the Total Sample, and of the Normal Functioning, Cognitive Impairment No Dementia, and Dementia Groups
| Total sample (N = 5748) | Normal functioning (N = 4,769) | Cognitive impairment (N = 979) | Cognitive impairment no dementia (N = 885) | Dementia (N = 94) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Variables | M/% | SD | M/% | SD | M/% | SD | M/% | SD | M/% | SD |
| Sex (% female) | 59% | — | 59% | — | 57% | — | 55% | — | 69% | — |
| Age (years) | 73.69 | 6.24 | 73.09 | 5.90 | 76.60 | 6.97 | 76.45 | 6.93 | 77.98 | 7.20 |
| Education | 13.10 | 2.63 | 13.31 | 2.54 | 12.07 | 2.79 | 12.07 | 2.81 | 12.03 | 2.64 |
| Ethnicity (% White) | 91% | — | 92% | — | 86% | — | 86% | — | 89% | — |
| Smoking (current/former smoker) | 52% | — | 52% | — | 51% | — | 51% | — | 49% | — |
| Diabetes | 22%b | — | 21% | — | 25% | — | 26% | — | 21% | — |
| Depressive symptoms | 1.07b | 1.65 | 1.00 | 1.60 | 1.40 | 1.85 | 1.39 | 1.85 | 1.49 | 1.87 |
| Vigorous physical activity | 3.03b | 1.27 | 2.98 | 1.29 | 3.31 | 1.14 | 3.30 | 1.15 | 3.43 | 1.05 |
| Moderate physical activity | 2.08b | 1.22 | 2.02 | 1.20 | 2.38 | 1.28 | 2.34 | 1.28 | 2.71 | 1.28 |
| Subjective agea | −0.16 | 0.14 | −0.17 | 0.14 | −0.13 | 0.15 | −0.13 | 0.15 | −0.12 | 0.12 |
| Baseline cognition score | 16.34 | 2.83 | 16.74 | 2.79 | 14.37 | 2.13 | 14.44 | 2.14 | 13.77 | 1.90 |
aSubjective age = (Felt Age − Chronological Age)/Chronological Age.
bDue to missing data: N = 5,702 for diabetes, N = 5,725 for depressive symptoms, N = 5,585 for vigorous physical activity, and N = 5,188 for moderate physical activity.