Old 02-24-21, 09:28 AM
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Iride01
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Mostly they guess. It's not something that can be directly measured. Your weight is about the only thing that it can tell you as result of direct measure. Everything else is a result of some indirect measurement and comparing that to some study of what it was for a group of people that may not be you.

Typically it's accurate to some degree. But leaves lots of room for argument if you are going to compare your results with another.
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