As a lead-in: a ‘Family Plan’ in the ED is when there are several patients in the same room, usually with the same complaint, but not always. For some reason nobody’s last name is the same, either, but that’s beside the point. I have always held that one of them might be ill, and the rest are there because, well, they’re there.
Now comes MDOD with a fiendishly elegant theorem: M.D.O.D.: The Snidely Whiplash Inverse Proportionality Theorem of “Family Plans”
Though I haven’t done the math, it looks about right from here.