Kudos to you for being a pioneer in examining the connection between DOC involvement and outcomes. Obviously the surface has barely been scratched; this subject fairly cries out for more in-depth study. My personal hunch is that the correlation will prove to be strong, but a hunch is just that -- an unsubstantiated belief. As a relentless empiricist, my mantra is always "show me the data!"
As someone else commented, it's interesting that so many DOC habitués don't let their health care teams know about their participation. I'm afraid I probably tell my doctor about it to the point of boredom. :-)
Another thing I would like to know is just how broad and deep the health care profession's antipathy to the very idea of the DOC really is. I've heard many anecdotes suggesting that this prejudice is widespread, but as someone said, the plural of "anecdote" is not "evidence".