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Table 2 Distribution of body mass index (BMI) z-score, BMI categories and motor skills

From: Obesity and motor skills among 4 to 6-year-old children in the united states: nationally-representative surveys

  Boys Girls
  4 y
n = 2 450a
5-6 y
n = 2 300
4 y
n = 2 700
5-6 y
n = 2 400
Body mass index (BMI)     
Z-score (mean, SE) 0.62 (0.03) 0.63 (0.03) 0.63 (0.03) 0.65 (0.03)
CDC categories (%)     
Underweight 2.2 1.9 1.8 1.9
Normal 63.8 65.1 63.6 64.1
Overweight 17.3 17.2 19.5 18.7
Obesity 16.8 16.1 15.1 15.1
IOTF and Cole categories b (%)     
Underweight 0.9 0.5 0.8 0.5
Normal 77.1 75.9 73.5 70.1
Overweight 15.7 16.6 17.2 19.0
Obesity 6.3 7.0 8.5 10.4
Motor skill c     
Gross motor skill     
Balance at least 10 sec. (%)     
Right foot 45.8 75.0 53.6 83.3
Left foot 44.6 74.4 52.5 81.9
Hop 5 times (%)     
Right foot 66.2 88.1 70.4 92.2
Left foot 61.3 85.5 63.9 89.8
Jump distance (inches) (mean, SE) 27.9 (0.24) 32.4 (0.28) 24.7 (0.28) 29.9 (0.31)
Skip at least 8 steps (%) 20.5 37.7 32.4 59.2
Walk backwards 6 steps on line (%) 33.9 38.3 40.9 48.6
Bean bag catch (at least 5 caught) (%) 42.1 51.8 38.3 50.8
Fine motor skill c     
Blocks (%)     
Passed one (either tower or gate) 44.1 - 44.9 -
Passed both 42.9 - 42.9 -
Gate passed - 79.2 - 81.8
Copy form (mean, SE) 3.2 (0.04) 2.5 (0.04) 3.8 (0.04) 2.3 (0.04)
  1. Estimations of percentages, means and standard errors of the mean (SE) are weighted and take into account the complex sampling design.
  2. BMI; Body mass index, CDC; Centers for Disease Control and prevention, IOTF; International Obesity Task Force
  3. aUnweighted sample size rounded to the nearest 50. bSee definitions in the Methods section. cPercentages of passing the test are presented (except for jump distance).