Table 1.
Sample descriptive statistics.
| Total (n = 551) | SD (n = 275) | WUSTL (n = 276) | p for difference between locations | ||
|---|---|---|---|---|---|
| % Female | % | 74 | 78 | 69 | 0.022 |
| Chronological Age | Yr | 71.5 (4.8) | 72.1 (4.9) | 70.9 (4.7) | 0.004 |
| Brain predicted age | Yr | 69.6 (7.4) | 71.6 (7.3) | 67.6 (7) | <0.001 |
| Predicted BrainAge Difference (BPAD) | Yr | − 1.9 (6.2) | − 0.5 (6.4) | − 3.4 (5.7) | <0.001 |
| Education | Yr | 16.2 (2.2) | 16.2 (2) | 16.1 (2.3) | .709 |
| % APOE E4 genotype | % | 30 | 26 | 34 | 0.025 |
| Height | M | 1.7 (0.1) | 1.6 (0.1) | 1.7 (0.1) | <0.001 |
| Weight | Kg | 77.6 (16.6) | 75.1 (16.5) | 80 (16.4) | 0.001 |
| BMI | kg/m2 | 28.1 (5.1) | 27.8 (5.3) | 28.4 (5) | 0.173 |
| Body Fat | % | 39.8 (7.6) | 40.1 (7.3) | 39.5 (7.9) | 0.376 |
| Visceral Adipose Tissue | Kg | 1.3 (0.9) | 1.3 (0.9) | 1.4 (1) | 0.228 |
| Resting Heart Rate | BPM | 69 (10) | 68 (10) | 69 (10) | 0.100 |
| Estimated Maximal Capacity | METS | 7.1 (1.8) | 6.6 (1.5) | 7.6 (1.9) | <0.001 |
| Total Physical Activity | CPM | 1941 (509) | 1994 (532) | 1888 (480) | 0.014 |
| Total Sleep Time | hours/night | 6.4 (0.9) | 6.4 (0.9) | 6.4 (1.0) | 0.941 |
| Sleep Efficiency | % | 84.3 (6.6) | 84.3 (6.0) | 84.3 (7.2) | 0.976 |
All values presented as mean (SD) unless otherwise noted BMI=Body Mass Index; CPM=Counts per Minute.