Table 1.
Demographic characteristics of the included sample
| All participants (n = 815) | Girls (n = 463) | Boys (n = 352) | ||
|---|---|---|---|---|
| Sex, % female | 56.5 | – | – | |
| Acorn SES, % | High | 62.3 | 62.9 | 61.7 |
| Medium | 23.6 | 24.4 | 22.4 | |
| Low | 14.1 | 12.7 | 15.9 | |
| Age at dietary sub-study, years, mean (SD) | 15.0 (0.3) | 15.0 (0.3) | 15.0 (0.3) | |
| BMI z-score (SD) | 1.04 (0.17) | 1.05 (0.17) | 1.03 (0.17) | |
| Mean daily sleep duration, hrs, mean (SD) | 7.88 (1.10) | 8.06 (1.13) | 7.66 (1.00)*** | |
| Mean timing of sleep midpoint, hrs:mins, mean (SD) | 03:49 (1:02) | 03:53 (1:03) | 03:44 (1:01)* | |
| Reported energy intake, kcals, mean (SD) | 1796 (614) | 1649 (552) | 1988 (638)*** | |
| Energy density of food, kcal/g, mean (SD) | 2.12 (0.48) | 2.09 (0.48) | 2.16 (0.47)* | |
| Fruit and vegetables (energy adjusted to 1800 kcals/d), grams, median (IQR) | 137.3 (130.4) | 147.8 (132.0) | 123.6 (127.1)** | |
| PAEE, kJ/kg/day (SD) | 76.3 (27.1) | 69.1 (24.7) | 85.6 (27.3)*** | |
Test of statistically significant differences between male/female sample: *p < 0.05, **p < 0.01, ***p < 0.001