Interpretation of the plotted BMI-for-age is based on the established cutoff values previously shown.
These percentiles indicate the rank of BMI in a group of 100 children of the same gender and age. For example, in a group of 100 children:
When assessing physical growth, it is desirable to have a series of accurate measurements to establish an observed growth pattern. Having a series of measurements takes into consideration short- and longer-term conditions and provides a context for individual measurements in interpretation. 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.
Growth patterns that fall outside the established parameters, the 5th and 95th percentile for any given anthropometric indices, suggest the need to recheck measurements, plots, and calculations and make any necessary corrections or adjustments. If measurements are correct, further evaluation is needed to determine the cause.