Table 1.
Descriptive statistics for variables at the child level (level-1)
| Child-level variables (mean ± SD) | ||||
|---|---|---|---|---|
| Boys (N = 305) | Girls (N = 381) | t | p- value | |
| Height (cm) | 143.46 ± 6.42 | 143.49 ± 7.06 | 0.060 | 0.952 |
| Weight (kg) | 40.52 ± 9.23 | 40.28 ± 9.23 | -0.332 | 0.740 |
| BMI (kg/m2) | 19.54 ± 3.45 | 19.41 ± 3.36 | -0.511 | 0.610 |
| Number of siblings | 0.97 ± 0.80 | 0.95 ± 0.83 | -0.230 | 0.818 |
| SED time | 449.73 ± 73.07 | 482.21 ± 66.45 | 6.085 | <0.001 |
| Sleep time (hours/day) | 8.14 ± 1.02 | 8.21 ± 0.96 | 0.964 | 0.335 |
| BMI classification (%) | χ 2 | p- value | ||
| Normal-weight | 49.05% | 58.0% | 4.920 | 0.026 |
| Overweight | 15.1% | 17.6% | 0.772 | 0.380 |
| Obese | 35.4% | 24.4% | 9.895 | 0.002 |
| Annual family income | ||||
| Category 1 | 14.1% | 22.7% | ||
| Category 2 | 33.2% | 29.3% | ||
| Category 3 | 21.2% | 16.7% | ||
| Category 4 | 11.6% | 9.3% | ||
| Category 5 | 7.1% | 7.0% | ||
| Category 6 | 4.6% | 6.0% | ||
| Category 7 | 2.9% | 3.7% | ||
| Category 8 | 5.4% | 5.3% | ||
| Computer use on school days | ||||
| Did not use | 36.4% | 46.2% | ||
| <1 hour | 23.3% | 29.4% | ||
| 1 hour | 21.0% | 16.8% | ||
| 2 hours | 12.8% | 5.2% | ||
| 3 hours | 3.3% | 1.8% | ||
| 4 hours | 1.6% | 0.3% | ||
| 5 or more hours | 1.6% | 0.3% | ||