Proposes a new type of growth chart that plots BMI againt the usual isobars plus an additional set that represent multiples of the 95th percentile for age/gender (x 1.1, x 1.2, x 1.3, etc.). Offers a way to indicate changes in body weight for the very obese that are perhaps more intuitive than the usual z-score method, and definitely more meaningful than percentiles. The screen shot in the article has been modified to label the isobars in a way that the software does not support.
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