Table 1.
Description of cross-sectional sample at grade 6 (N = 5,482).
| Boys (n = 2,585) | Girls (n = 2,897) | |||||
|---|---|---|---|---|---|---|
| Median | Mean | SD | Median | Mean | SD | |
| Continuous variables, units | ||||||
| Age, years | 11.8 | 11.8 | 0.5 | 11.7 | 11.7 | 0.4 |
| Weight, kg | 47.8 | 51.0 | 15.6 | 48.2 | 51.4 | 15.1 |
| Height, cm | 149.8 | 150.2 | 8.1 | 151.6 | 151.4 | 7.2 |
| Body mass index, kg/m2 | 21.1 | 22.3 | 5.4 | 20.9 | 22.2 | 5.4 |
| BMI z-score | 1.118 | 0.958 | 1.090 | 0.917 | 0.827 | 1.075 |
| Waist circumference, cm | 72.5 | 75.8 | 15.3 | 72.9 | 75.5 | 14.0 |
| WHtR | 0.484 | 0.503 | 0.091 | 0.480 | 0.498 | 0.084 |
| HOMA-IR | 2.1 | 2.9 | 2.9 | 2.6 | 3.3 | 2.7 |
| Total cholesterol/HDL cholesterol | 3.0 | 3.1 | 0.9 | 2.9 | 3.1 | 0.8 |
| HDL cholesterol, mmol/L | 1.34 | 1.38 | 0.33 | 1.32 | 1.35 | 0.31 |
| Triglycerides, mmol/L | 0.84 | 0.99 | 0.59 | 0.87 | 1.01 | 0.57 |
| Systolic BP, mmHg | 107.5 | 108.1 | 10.2 | 106.5 | 106.8 | 9.7 |
| Diastolic BP, mmHg | 63.0 | 63.5 | 8.9 | 63.5 | 63.9 | 8.6 |
| Glucose, mg/dL | 94.0 | 94.4 | 6.6 | 92.0 | 92.6 | 6.6 |
| Categorical variables, % | — | — | ||||
| Fatness levela (high/lower) | 45.9 / 54.1 | 44.6 / 55.4 | ||||
| Ancestryb (H/B/W/other) | 52.2 / 18.4 / 21.2 / 8.2 | 53.9 / 19.7 / 18.0 / 8.4 | ||||
| Pubarche (no/yes) | 73.5 / 26.5 | 57.2 / 42.8 | ||||
aHigh-fatness students identified by being above the sex-specific median value for both BMI z-score and WHtR; the remaining students were designated as lower-fatness.
bH: Hispanic; B: non-Hispanic black; W: non-Hispanic white.