Ok, well I don’t have the book, or links to the studies it’s based on, so that’s not particularly helpful.

I throughly scanned the page for data sources and scholarly papers, and also read some of the major concepts and provided anecdotes. I did not see any further studies or data linked in either of the pages you linked to yourself, but if I did miss something, please feel free to point it out.

Once again, thank you for providing the source data you already did. It’s a fairly complicated dataset, so it’ll take some effort to grok.