Table 1.
Participant demographics
| Total (n = 378) | |||
|---|---|---|---|
| Mean ± SD | Range (min, max) | ||
| Age | 65.6 ± 3.0 | 60.1, 71.2 | |
| Sex (%) | Female | 255 (67%) | - |
| Male | 123 (33%) | - | |
| Education (years) | 16.6 ± 3.2 | 7, 30 | |
| Accelerometer waking wear time (valid files only; mins) | 936.6 ± 56.5 | 756.5, 1106.8 | |
| Arithmetic means of time-use behaviours (min/day) | MVPA | 90.6 ± 47.0 | 3.4, 301.7 |
| LPA | 178.6 ± 50.6 | 57.9, 342.6 | |
| SB | 667.4 ± 91.5 | 410.3, 982.3 | |
| Sleep | 501.8 ± 58.5 | 330.8, 741.0 | |
| Compositional means of time-use behaviours (min/day) | MVPA | 90.7 ± 47.1 | 3.4, 301.7 |
| LPA | 178.8 ± 50.7 | 57.8, 346.6 | |
| SB | 668.2 ± 92.2 | 410.8, 968.1 | |
| Sleep | 502.2 ± 57.5 | 331.4, 712.5 | |
| Brain volume (ml) | TIV | 1551.0 ± 141.2 | 1202.0, 2279.0 |
| Global GM | 596.0 ± 50.8 | 466.3, 843.0 | |
| Temporal lobe | 95.3 ± 9.2 | 67.4, 130.9 | |
| Hippocampus | 6.2 ± 0.6 | 4.6, 8.5 | |
| Lateral ventricles | 25.0 ± 12.5 | 6.0, 84.5 | |
| Frontal lobe volume | 168.0 ± 16.9 | 127.0, 240.0 | |
| WMH | 1.9 ± 3.4 | 0.0, 33.7 | |
Note: Values are presented in the “Mean ± SD” column as either mean ± SD for numeric variables or count (percentage) for categorical variables. Range data represents minimum and maximum values. MVPA = moderate-vigorous physical activity; LPA = light physical activity; SB = sedentary behaviour; TIV = total intracranial volume; GM = grey matter; WMH = white matter hyperintensities. Volumetric data are presented in raw form (i.e., prior to adjusting for site, total intracranial volume and use of distortion correction during imaging). ‘Arithmetic means’ represent the average minutes of time spent in each behaviour before applying the closure function. ‘Compositional means’ represent the geometric average of time use values after applying the closure function (closing composition to sum up to 1440 minutes).