A good question gmh and, for the moment, as thughes mentioned, it's impossible to answer well atm. One of the original aims of the BIABacus has been to provide a structure where things that have never been measured well, if at all, before (like this) can be measured by the individual. Another aim of the BIABacus is to enable an easy collection of numbers based on the many rather than the few.
The next BIABacus Pre-Release has a new section on the second tab where you can use your bathroom scales to measure many critical numbers. A screenshot can be seen in
this post. See the right hand column?
People filling in that, over time, will give an answer to your question. The same goes for many other questions.
PP
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