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Outline
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What Is BMI?




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Advantages of BMI-for-Age
  • Provides a reference for adolescents that was not previously available


  • Consistent with adult index so it can be used continuously from 2 years of age to adulthood


  • Tracks childhood overweight into adulthood



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Tracking BMI-for-Age from Birth to 18 Years with                    Percent of Overweight Children who Are Obese at Age 251
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Advantages of BMI-for-Age
  • BMI-for-age relates to health risks


    • Correlates with clinical risk factors for cardiovascular disease including hyperlipidemia, elevated insulin, and high blood pressure


    • BMI-for-age during pubescence is related to lipid levels and high blood pressure in middle age

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Why Use BMI-for-Age?




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Shape of Weight-for-Stature Curve  versus BMI-for-Age Curve
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BMI-for-Age Cutoffs
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"Using the 85th and 95th..."
  • Using the 85th and 95th percentiles as cut points, few children are incorrectly identified as over-fat but some over-fat children will be missed.


  • It is desirable to correctly identify those children not at risk of overweight or overweight.
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Calculating BMI with the Metric System




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Calculating BMI with the English System




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Interpreting the BMI-for-Age Cutoffs
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Interpreting the BMI-for-Age Chart
  • BMI-for-age indicates a child’s weight in relation to his/her height for a specific age and gender
  • Need a series of BMI plots to determine the growth trend


  • If indices deviate from normal growth patterns, further assessment may be needed


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Example: “Sam”
  • Name:    Sam
  • Weight:  37 lb 4 oz  (16.9 kg)
  • Height:   41.5 inches  (105 cm)
  • Age: 3.5 years
  • BMI: 15.2


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 Sam’s BMI Plotted on Boy’s BMI-for-Age Chart
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Steps to Plot BMI-for-Age
  • Obtain accurate weight and height measurements
  • Select the appropriate growth chart
  • Record the data
  • Calculate BMI
  • Plot measurements
  • Interpret plotted measurements
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