Table 1.
Participant characteristics and mean and Standard Deviation for the study variables.
| Total (N = 29) |
|
|---|---|
| Female, No. (%) | 14 (48.3) |
| Chronological age in years, M (SD) | 40.41 (6.73) |
| Intellectual disability level, No. (%) | |
| Mild | 14 (48.3) |
| Moderate | 15 (51.7) |
| Body mass index e, M (SD) | 34.45 (9.06) |
| White matter integrity, M (SD) | |
| Superior longitudinal fasciculus, left FA | 0.43 (0.03) |
| Superior longitudinal fasciculus, right FA | 0.45 (0.03) |
| Inferior longitudinal fasciculus left, FA | 0.48 (0.03) |
| Inferior longitudinal fasciculus, right FA | 0.50 (0.04) |
| Superior longitudinal fasciculus, left MD | 0.74 (0.04) |
| Superior longitudinal fasciculus, right MD | 0.74 (0.03) |
| Inferior longitudinal fasciculus, left MD | 0.85 (0.05) |
| Inferior longitudinal fasciculus, right MD | 0.82 (0.06) |
| Sleep | |
| Total sleep time, M (SD) | 429.87 (83.42) |
| Wake after sleep onset, M (SD) | 107.96 (59.68) |
| Sleep efficiency M (SD) | 76.85 (11.37) |
| Number of awakenings, M (SD) | 21.61 (11.37) |
| Length of awakenings (min), M (SD) | 4.90 (2.37) |
| Movement index, M (SD) | 26.18 (10.68) |
| Sleep fragmentation index M (SD) | 43.16 (16.52) |
Note: Unless otherwise indicated, data are expressed as mean (SD). Intellectual disability levels reflect the following mental age: mild: ≥9 years, moderate: 4 to 8 years. Sleep variables are average over a 7-day period. FA = fractional anisotropy. MD = mean diffusivity (in 10−3 mm2/s). e Calculated as weight in kilograms divided by height in meters squared. Percent daytime in sedentary and moderate-to-vigorous calculated with sleep as non-wear time.