Mannheim Peritonitis Index. A prognostic scoring system used to predict mortality in patients with peritonitis. Long-term survivors have an MPI score of about 20; non-survivors have a score of 33. Risk factorâScore.
What we do know for sure about the Three-Eyed Raven is that he is a Greenseer, gifted with the ability to see the past, present, and future and communicate through dreams. Greensight is more common with the Children of the Forest, but some humans, like the Three-Eyed Raven, also have this ability.
It's possible that the Three Eyed Raven was aware that Bran could influence the course of history, which would explain why he had been waiting for the young warg in a tree for so many years. Then again, the Raven did seem pretty insistent that a young Ned Stark couldn't hear his son during that Tower of Joy flashback.