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

Interpretation
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9. Interpretation

Interpretation of the plotted BMI-for-age is based on the established cutoff values previously shown.

> 95th percentile 

Obesity 
85th to < 95th percentile
Overweight
< 5th percentile 
Underweight 

These percentiles indicate the rank of BMI in a group of 100 children of the same sex and age from the reference population. For example, in a group of 100 children from the reference population,

  • 5 children will have a BMI-for-age that is at or above the 95th percentile.

  • 10 will have a BMI-for-age that is between the 85th and 95th percentiles.

  • 5 will have a BMI-for-age less than the 5 percentile.

  • 80 children will have a BMI-for-age that is within the normal range.

When assessing physical growth, it is desirable to have a series of accurate measurements to monitor a child’s growth pattern over time. BMI is a useful tool that triggers assessment; however, other clinical information, such as a review of the patient’s family and medical histories, a review of the BMI trajectory, an assessment of body fat distribution, diet and activity habits, and appropriate laboratory tests, influences the need for intervention (Barlow, 2007).To obtain a clear understanding of the growth pattern observed on the BMI-for-age chart, plot the weight-for-age and stature-for-age charts to determine the pattern of weight and stature separately.

 

Example

 

BMI values that fall outside the established parameters, the 5th and 95th percentiles, suggest the need to recheck measurements, plots, and calculations, and make any necessary corrections or adjustments. If measurements are correct, BMI classification needs to be integrated with other information, such as the growth pattern, familial obesity, and medical risks to assess the child’s health risk (Barlow, 2007).

Providers may refer to the following resources for more information about the prevention, assessment, and treatment of overweight and obesity among children and teens.

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