Table 1. Clinical and Demographic Characteristics.
| Characteristic | No. (%) |
|---|---|
| Age, mean (SD), y | 75.7 (5.8) |
| Sex | |
| Men | 52 (44.1) |
| Women | 66 (55.9) |
| Education level, median (IQR), y | 12 (9-12) |
| BMI, mean (SD) | 23.2 (3.3) |
| MMSE score, median (IQR) | 26 (25-28) |
| APOE4 | 17 (14.4) |
| Ever smoked | 5 (4.2) |
| Ever drank | 42 (35.6) |
| Medical history | |
| Hypertension | 67 (56.8) |
| Diabetes | 24 (20.3) |
| Hypercholesterolemia | 37 (31.4) |
| Wearable sensor data | |
| Walking steps, mean (SD), steps/d | 4610.5 (2558.4) |
| Conversation time, median (IQR), min/d | 206.9 (148.0-259.7) |
| TST, mean (SD), min/d | 403.7 (69.2) |
| WASO, median (IQR), min/d | 23.3 (13.3-33.0) |
| Sleep efficiency, mean (SD), %/d | 94.1 (3.4) |
| Waking time count, median (IQR), counts/d | 0.52 (0.34-0.83) |
| Nap time, median (IQR), min/d | 38.4 (21.2-64.1) |
| Global uptake from neuroimaging data, SUVR | |
| PiB, median (IQR) | 0.93 (0.83-1.33) |
| FDG, mean (SD) | 0.92 (0.08) |
Abbreviations: APOE4, apolipoprotein E ε4; BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); FDG, fluorine-18 F-fluorodeoxyglucose; IQR, interquartile range; MMSE, Mini-Mental State Examination; PiB, carbon-11 labeled Pittsburgh compound B; SUVR, standardized uptake value ratio; TST, total sleep time; WASO, time awake after sleep.