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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.