Boys | Girls | Total | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
U.S. ISCOLE | NHANES | Q | † p | U.S. ISCOLE | NHANES | Q | † p | U.S. ISCOLE | NHANES | Q | † p | |
N | 203 | 285 | - | - | 288 | 301 | - | - | 491 | 586 | - | - |
Age (years) | 10.03 ± 0.04 | 10.42 ± 0.06 | 29.25 | <0.001 | 9.85 ± 0.03 | 10.45 ± 0.05 | 105.88 | <0.001 | 9.92 ± 0.03 | 10.43 ± 0.04 | 104.04 | <0.001 |
BMI (kg/m 2 )* | 18.65 ± 0.25 | 19.11 ± 0.30 | 1.39 | 0.239 | 19.04 ± 0.24 | 19.97 ± 0.39 | 4.12 | 0.042 | 18.87 ± 0.18 | 19.52 ± 0.24 | 4.41 | 0.036 |
Overweight (%) | 14.3 | 15.0 | 0.08 | 0.779 | 18.4 | 18.9 | 0.02 | 0.880 | 16.7 | 16.8 | 0.01 | 0.960 |
Obese (%) | 16.3 | 17.5 | 0.16 | 0.685 | 16.3 | 18.6 | 0.60 | 0.437 | 16.3 | 18.0 | 0.67 | 0.412 |
Valid days | 6.4 ± 0.05 | 6.0 ± 0.09 | 15.09 | <0.001 | 6.4 ± 0.04 | 5.9 ± 0.09 | 25.77 | <0.001 | 6.4 ± 0.03 | 6.0 ± 0.06 | 35.56 | <0.001 |
Normal weight | 6.3 ± 0.07 | 6.1 ± 0.11 | 2.35 | 0.125 | 6.4 ± 0.05 | 5.8 ± 0.09 | 33.96 | <0.001 | 6.4 ± 0.04 | 6.0 ± 0.08 | 20.00 | <0.001 |
Overweight | 6.5 ± 0.14 | 6.0 ± 0.20 | 4.19 | 0.041 | 6.3 ± 0.10 | 5.9 ± 0.18 | 3.77 | 0.052 | 6.4 ± 0.08 | 6.0 ± 0.14 | 6.15 | 0.013 |
Obese | 6.6 ± 0.09 | 5.9 ± 0.16 | 14.54 | <0.001 | 6.3 ± 0.12 | 5.7 ± 0.15 | 9.76 | 0.002 | 6.4 ± 0.08 | 5.8 ± 0.11 | 19.46 | <0.001 |
Waking wear time (minutes/day) | 888.5 ± 3.6 | 832.6 ± 6.4 | 57.95 | <0.001 | 881.4 ± 2.9 | 811.2 ± 7.1 | 83.78 | <0.001 | 884.4 ± 2.2 | 822.6 ± 4.3 | 163.71 | <0.001 |
- Wear during waking periods | ||||||||||||
Normal weight | 887.6 ± 4.4 | 834.5 ± 8.8 | 29.13 | <0.001 | 875.7 ± 3.5 | 811.0 ± 10.8 | 32.48 | <0.001 | 880.8 ± 2.8 | 824.2 ± 6.6 | 62.33 | <0.001 |
Overweight | 891.6 ± 7.9 | 827.3 ± 9.3 | 27.77 | <0.001 | 885.0 ± 6.1 | 808.1 ± 9.9 | 43.73 | <0.001 | 887.3 ± 4.8 | 817.2 ± 7.7 | 59.69 | <0.001 |
Obese | 889.0 ± 10.1 | 826.0 ± 12.8 | 14.93 | <0.001 | 898.6 ± 7.9 | 811.7 ± 10.1 | 45.93 | < 0.001 | 894.6 ± 6.2 | 819.1 ± 8.9 | 48.45 | < 0.001 |
Total wear time (minutes/day) | 1358.7 ± 6.2 | N/A | - | - | 1355.8 ± 5.8 | N/A | - | - | 1357.0 ± 4.2 | N/A | - | - |