There has been very little study of polyamory in any arena. I don't know of any source for information on any of that.
Hell, we can't even get solid research on how many folks engage in poly.
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.