From publisher blurb:
According to the core Cepheus Engine rules, characters die when all three of their physical characteristic are reduced to zero. However, under the following optional rules, the science of medicine can sometimes revive a mortally wounded character. This has been possible since the dawn of modern medicine, but becomes easier to perform at higher tech levels.
Under these rules, a character whose all three physical characteristics fall to zero is not necessarily dead, but only possibly so. There is still some hope - given prompt medical attention.