MAXCON or (MAX): The Maximum "health" points that your character can have. If the number is highlighted, then your character has picked up a life-threatening illness. This character requires medical treatment.
Initial MAXCON ranges from 22 to 36 (some possible calculations are 21+1d15 or 20+2d8)
The higher this value, the more damage you can take before dying. Each promotion adds 2 pts to your MAXCON.