The age-factor is not an arbitrary formula, it's based on underwater weighing.
Formula-based factors are
-gender
-age
-height
The rest is conductivity.
One of the reasons for having those factors is that the device is pretty decent for measuring subcutaneous fat but can't 'see' visceral (organ) fat.. there it is using formulas derived from decades of doing underwater weighing experiments.. can't help it either. It's just the way it is.. we get fatter when we age and women are fatter around organs than men are.
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