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Table 2 Descriptive characteristics of 9–11 year old U.S. children participating in accelerometer data collection during the 2012–2013 ISCOLE study and in the 2003–2006 NHANES accelerometer sub-study

From: Improving wear time compliance with a 24-hour waist-worn accelerometer protocol in the International Study of Childhood Obesity, Lifestyle and the Environment (ISCOLE)

  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 - -
  1. Note. Data presented as M ± SE (except for frequencies and percentage values). N/A represents an incalculable value as NHANES employed a waking-hours protocol, not a 24-hour protocol. Dashes (−) indicate the absence of a statistical comparison. *Height data missing for 2 NHANES participants (1 boy and 1 girl). Probability (p) value corresponding to Cochran’s Q-Test for Heterogeneity evaluated at 1 degree of freedom.