I assume you've read this: http://www.exrx.net/Testing/BFTestComparisonStudy.html
This may help. http://www.ncbi.nlm.nih.gov/pubmed/17535865
There is a free text there. I didn't read it.
Here's another: http://www.nature.com/oby/journal/v13/n ... 0567a.html
This booklet tells you how to take measurements. http://www.cdc.gov/nchs/data/nhanes/nha ... anthro.pdf
If you find anything definative, let us know. I know I'm interested in it and I'm sure others are. I think the Nature article might prove to be the most useful.