Calculation is same: The formula to calculate the bmi is the same for people of all ages. However, the standards of how much of the population is above a certain bmi number changes with age, location, ethnic background and overall health. A 13 year old with a bmi of 22 may be way at the top of the obesity scale, while, for an adult, a bmi of 22 is just middle-level overweight.
Answered 3/13/2015
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