I saw some rules like 30 years ago on survivor chances based on their behavior, I have trouble finding them but roughly it was:
Half of those who go unconscious but then wake up within an hour will survive
75% of those who vomit but stop within an hour will live, but 25% of those who cannot stop vomiting will live.
It went on into burn patients as well - it was data from the nuclear blasts in WW2. I remember it because years later when I did some medicine I realized the first one was brain injury and the second was intestinal radiation injury. If your intestines were sterilized you won’t be here much longer.