Centers for Disease Control and Prevention

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Training Module: Using the BMI-for-Age Growth Charts

What is BMI?
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For Children, BMI Differs By Age and Gender
Example chart

Because adiposity varies with age and gender during childhood and adolescence, BMI is age and gender specific. As illustrated on this growth chart for boys, in a growth pattern established along the 95th percentile, BMI-for-age reached a minimum at 4 years of age and then increased with increasing age.