Table 1 Descriptive statistics for the whole sample and by study site
Countries | All | AUS | BGD | BEL | BRA | CZE | DNK | HKG | IND | ISR | MYS | NZL | NGA | PRT | ESP | USA | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Cities | All sites | Melbourne | Dhaka | Ghent | Curitiba | Olomouc | Hradec Králové | Odense | Hong Kong | Chennai | Haifa | Kuala Lumpar | Auckland | Wellington | Gombe | Porto region | Valencia | Baltimore | Seattle |
Overall N | 4852 | 372 | 90 | 224 | 419 | 56 | 49 | 126 | 549 | 315 | 223 | 325 | 340 | 160 | 245 | 143 | 373 | 438 | 405 |
Age (years) | |||||||||||||||||||
Mean | 14.6 | 14.9 | 13.9 | 13.3 | 14.1 | 13.9 | 15.8 | 13.0 | 14.4 | 13.8 | 15.3 | 14.6 | 14.8 | 14.5 | 15.3 | 15.9 | 16.6 | 14.1 | 14.0 |
Std Dev | 1.7 | 1.6 | 1.8 | 1.4 | 1.7 | 2.0 | 1.7 | 1.2 | 1.7 | 1.5 | 1.4 | 1.2 | 1.4 | 1.3 | 1.6 | 1.2 | 0.8 | 1.4 | 1.4 |
Gender | |||||||||||||||||||
Male | 46.6% | 38.7% | 53.3% | 39.7% | 48.7% | 33.9% | 49.0% | 38.1% | 45.4% | 52.4% | 39.9% | 40.3% | 42.1% | 88.4% | 51.1% | 37.1% | 43.4% | 46.6% | 53.6% |
Highest education in the household | |||||||||||||||||||
< College degree | 39.6% | 18.5% | 42.2% | 22.8% | 57.3% | 30.4% | 4.1% | 28.6% | 63.2% | 52.4% | 37.2% | 50.5% | 38.2% | 21.9% | 42.9% | 48.3% | 44.0% | 25.1% | 23.2% |
≥ College degree | 53.1% | 35.5% | 57.8% | 75.4% | 42.7% | 28.6% | 40.8% | 70.6% | 36.8% | 47.3% | 61.4% | 35.4% | 50.9% | 71.3% | 54.3% | 36.4% | 56.0% | 74.2% | 76.8% |
Missing | 7.3% | 46.0% | 0% | 1.8% | 0% | 41.1% | 55.1% | 0.8% | 0% | 0.3% | 1.3% | 14.2% | 10.9% | 6.9% | 2.9% | 15.4% | 0% | 0.7% | 0% |
Child IOTF grade for adjusted BMI | |||||||||||||||||||
Thinness 3 (BMI < 16) | 1.9% | 0.5% | 3.3% | 1.3% | 1.2% | 0% | 0% | 0% | 0.4% | 5.7% | 0.9% | 2.8% | 0.3% | 0% | 15.1% | 0% | 0.5% | 1.1% | 0.2% |
Thinness 2 (BMI 16 to < 17) | 3.0% | 1.3% | 2.2% | 3.1% | 1.2% | 1.8% | 0% | 3.2% | 2.4% | 9.2% | 2.7% | 5.8% | 0.3% | 0% | 15.1% | 0% | 0.8% | 1.4% | 0.5% |
Thinness 1 (BMI 17 to < 18.5) | 7.6% | 4.6% | 14.4% | 9.4% | 4.5% | 14.3% | 2.0% | 7.1% | 11.1% | 14.9% | 6.3% | 10.5% | 4.7% | 3.8% | 14.3% | 2.8% | 6.4% | 4.6% | 4.4% |
Normal weight 0 (BMI 18.5 to < 25) | 64.5% | 54.3% | 54.4% | 66.1% | 61.1% | 73.2% | 79.6% | 77.8% | 76.0% | 45.4% | 74.0% | 54.8% | 70.6%% | 74.4% | 47.8% | 54.5% | 70.8% | 65.5% | 70.9% |
Overweight 1 (BMI 25 to < 30) | 15.2% | 14.5% | 14.4% | 7.6% | 23.0% | 8.9% | 16.3% | 7.9% | 8.4% | 17.8% | 11.7% | 15.1% | 17.4% | 14.4% | 6.9% | 25.9% | 17.7% | 19.9% | 16.8% |
Obese 2 (BMI 30 +) | 5.0% | 4.3% | 4.4% | 1.3% | 8.9% | 1.8% | 2.0% | 0% | 1.8% | 7.0% | 2.7% | 8.3% | 5.9% | 6.3% | 0.6% | 6.3% | 3.5% | 7.3% | 6.9% |
Overweight or obese (BMI 25 +) | 17.2% | 18.8% | 18.8% | 8.9% | 31.9% | 10.7% | 18.3% | 7.9% | 10.2% | 24.8% | 14.4% | 23.4% | 23.3% | 20.7% | 7.5% | 32.3% | 21.2% | 27.2% | 23.7% |
Missing | 3.1% | 20.4% | 6.7% | 11.2% | 0.2% | 0% | 0% | 4.0% | 0% | 0% | 1.8% | 2.8% | 0.9% | 1.3% | 0% | 10.5% | 0.3% | 0.2% | 0.2% |
WHO SDS z-BMI (standard deviation score) | |||||||||||||||||||
Mean | 0.131 | 0.312 | 0.032 | -0.271 | 0.578 | -0.152 | 0.057 | -0.089 | -0.120 | -0.172 | 0.132 | 0.043 | 0.345 | 0.410 | -1.158 | 0.630 | 0.198 | 0.430 | 0.477 |
Std Dev | 1.294 | 1.229 | 1.524 | 1.130 | 1.263 | 0.977 | 0.879 | 1.014 | 1.061 | 1.699 | 1.054 | 1.496 | 1.072 | 1.072 | 1.617 | 1.025 | 1.013 | 1.256 | 1.077 |
CDC SDS z-BMI (standard deviation score) | |||||||||||||||||||
Mean | 0.051 | 0.226 | -0.077 | -0.300 | 0.442 | -0.189 | 0.010 | -0.003 | -0.155 | -0.282 | 0.084 | -0.034 | 0.277 | 0.306 | -1.263 | 0.503 | 0.130 | 0.329 | 0.380 |
Std Dev | 1.203 | 1.133 | 1.395 | 1.047 | 1.137 | 0.872 | 0.779 | 0.925 | 0.984 | 1.580 | 0.981 | 1.359 | 0.944 | 0.940 | 1.732 | 0.900 | 0.952 | 1.117 | 0.929 |
Sedentary time, total per valid day (min.day−1) | |||||||||||||||||||
Mean | 531.8 | 506.3 | 517.9 | 504.2 | 508.7 | 470.2 | 536.8 | 498.1 | 544.1 | 529.3 | 519.6 | 562.7 | 517.0 | 496.3 | 504.5 | 521.2 | 631.6 | 535.8 | 553.5 |
Std Dev | 88.1 | 78.8 | 98.4 | 76.0 | 93.7 | 100.0 | 95.5 | 79.6 | 80.4 | 83.5 | 76.2 | 89.6 | 81.8 | 73.0 | 78.9 | 63.7 | 69.5 | 82.7 | 78.7 |
Sedentary time total during school per valid day (min.day−1) | |||||||||||||||||||
Mean | 250.1 | 238.3 | 158.1 | 260.2 | 177.9 | 216.8 | 267.7 | 255.8 | 310.6 | 288.1 | 225.4 | 223.1 | 249.3 | 230.6 | 234.8 | 285.3 | 312.9 | 238.8 | 234.9 |
Std Dev | 64.5 | 38.4 | 48.9 | 43.7 | 69.6 | 49.9 | 62.3 | 38.0 | 48.7 | 57.1 | 58.9 | 61.4 | 42.4 | 38.5 | 58.7 | 60.1 | 37.5 | 42.6 | 43.7 |
Sedentary time total non-school per valid day (min.day−1) | |||||||||||||||||||
Mean | 341.4 | 315.7 | 392.4 | 302.0 | 374.4 | 306.2 | 363.7 | 472.0 | 309.1 | 311.5 | 319.8 | 389.2 | 324.6 | 319.4 | 325.0 | 310.3 | 417.6 | 353.2 | 357.5 |
Std Dev | 81.4 | 73.8 | 82.3 | 70.7 | 87.5 | 84.6 | 73.3 | 91.1 | 77.2 | 70.6 | 68.4 | 71.4 | 68.5 | 60.9 | 75.2 | 70.8 | 64.5 | 75.0 | 71.1 |
MVPA, total per valid day (min.day−1) | |||||||||||||||||||
Mean | 41.3 | 47.4 | 32.7 | 38.9 | 37.3 | 60.0 | 55.9 | 45.1 | 36.4 | 26.7 | 49.1 | 26.6 | 55.3 | 60.4 | 50.0 | 53.0 | 46.2 | 37.2 | 37.8 |
Std Dev | 22.6 | 22.1 | 26.3 | 16.8 | 23.2 | 25.6 | 19.8 | 19.4 | 18.0 | 17.1 | 18.9 | 17.2 | 23.5 | 23.2 | 29.5 | 22.7 | 20.2 | 19.6 | 19.0 |
MVPA, total during school per valid day (min.day−1) | |||||||||||||||||||
Mean | 16.3 | 22.3 | 8.9 | 19.9 | 11.9 | 18.0 | 18.4 | 25.0 | 15.7 | 11.0 | 18.6 | 9.9 | 22.0 | 24.6 | 14.4 | 29.4 | 14.6 | 12.8 | 14.4 |
Std Dev | 11.2 | 11.9 | 8.5 | 11.1 | 12.2 | 14.3 | 9.9 | 13.3 | 9.4 | 8.4 | 9.6 | 7.0 | 11.1 | 9.8 | 10.3 | 11.6 | 9.0 | 8.4 | 8.8 |
MVPA total non-school per valid day (min.day−1) | |||||||||||||||||||
Mean | 28.8 | 29.7 | 25.5 | 23.7 | 28.3 | 46.9 | 43.9 | 26.0 | 24.5 | 18.3 | 29.6 | 18.9 | 35.4 | 41.6 | 39.0 | 31.3 | 36.2 | 27.5 | 27.1 |
Std Dev | 18.1 | 16.4 | 21.6 | 12.5 | 19.6 | 23.1 | 16.7 | 14.5 | 13.7 | 12.7 | 16.1 | 13.3 | 18.6 | 19.9 | 24.4 | 18.5 | 18.3 | 16.2 | 15.3 |
Valid days of accelerometer wear time | |||||||||||||||||||
Mean | 7.0 | 6.9 | 7.1 | 7.2 | 6.7 | 6.2 | 6.5 | 6.2 | 7.0 | 7.1 | 7.2 | 7.0 | 7.3 | 7.1 | 6.9 | 6.9 | 6.3 | 7.3 | 7.3 |
Std Dev | 1.3 | 1.2 | 0.7 | 1.4 | 1.1 | 1.2 | 1.2 | 1.6 | 1.8 | 1.0 | 0.9 | 1.3 | 0.9 | 1.0 | 1.1 | 1.1 | 1.3 | 1.3 | 1.5 |
Average valid minutes per day of accelerometer wear time | |||||||||||||||||||
Mean | 807.6 | 786.1 | 843.9 | 797.4 | 806.8 | 794.6 | 804.9 | 774.3 | 776.3 | 817.2 | 804.1 | 820.7 | 809.1 | 808.0 | 829.0 | 795.5 | 860.3 | 813.6 | 799.3 |
Std Dev | 78.3 | 74.1 | 73.4 | 71.2 | 85.1 | 79.9 | 92.9 | 72.2 | 79.0 | 69.3 | 67.0 | 95.0 | 60.4 | 60.1 | 92.2 | 63.0 | 63.3 | 76.6 | 70.8 |
Average accelerometer wear time during school (minutes), total per valid day | |||||||||||||||||||
Mean | 363.0 | 361.7 | 256.1 | 401.4 | 273.0 | 347.2 | 362.7 | 394.9 | 428.3 | 421.5 | 343.6 | 315.8 | 377.1 | 373.1 | 340.5 | 423.0 | 395.0 | 340.9 | 337.1 |
Std Dev | 70.2 | 28.9 | 59.8 | 39.3 | 97.1 | 38.9 | 56.9 | 26.5 | 40.9 | 41.0 | 73.5 | 76.2 | 17.7 | 16.7 | 61.3 | 72.6 | 39.3 | 35.9 | 38.9 |
Average accelerometer wear time total non-school school (minutes), total per valid day | |||||||||||||||||||
Mean | 531.0 | 497.4 | 641.2 | 486.4 | 601.0 | 532.7 | 572.2 | 472.0 | 452.0 | 498.4 | 499.2 | 575.4 | 517.9 | 521.9 | 568.8 | 482.6 | 590.0 | 553.0 | 547.3 |
Std Dev | 99.9 | 86.6 | 72.8 | 88.7 | 108.4 | 95.6 | 89.5 | 91.1 | 93.1 | 88.0 | 89.3 | 81.5 | 67.6 | 64.8 | 109.3 | 88.4 | 68.2 | 86.2 | 82.0 |
ActiGraph model-filter comparable to GT3X + _LFE | |||||||||||||||||||
Comparable | 92.4% | 100% | 100% | 100% | 100% | 100% | 100% | 0% | 100% | 51.1% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 99.5% | 78.3% |