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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