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Table 1 Sample characteristics and days per week of physical activity among the 2012 NHANES National Youth Fitness Survey participants

From: Screen-based sedentary behavior and associations with functional strength in 6–15 year-old children in the United States

 

6-9 y

10-12 y

13-15 y

Full sample (6–15 y)

 

n = 491

n = 379

n = 354

n = 1224

Subject Charateristics

% of sampleb

% of sampleb

% of sampleb

% of sampleb

Sex

    

 Female

47

50

50

49

Race/Ethnicity

    

 non-Hispanic White

52

54

55

54

 non-Hispanic Black

14

12

15

14

 Hispanic

22

24

22

23

 Other

11

10

8

10

Weight Statusc

    

 Underweight

3

4

3

3

 Normal Weight

65

53

61

60

 Overweight

14

25

17

18

 Obese

19

19

20

19

Days of Physical Activity per Weeka

    

 0 days

2

5

7

4

 1-3 days

10

19

29

18

 4-6 days

26

32

40

32

 7 days

62

43

24

46

 Mean (95 % CI) (Days)d

5.9 (5.7 – 6.1)***

5.1 (4.8 – 5.3)

4.4 (4.2 – 4.6)

5.2 (5.0 – 5.4)

  1. aPhysical activity was self- or proxy reported as the number of days that the child was physically active (increased heart rate or breathing hard some of the time) for a total of at least 60 minutes in the past 7 days)
  2. bNationally representative estimates taking into account the survey design of the 2012 NNYFS
  3. cWeight status of children were based on BMI-for-age percentiles
  4. dA linear trend across the three age categories for average days of physical activity was tested using a simple linear regression model accounting for the survey design of the 2012 NNYFS
  5. ***Indicates a significant regression coefficient for a linear trend (p < 0.001) across the three sub age groups