The phrase "decreased survival" means that there is a reduction in the ability to continue living or staying alive.
Sentences with «decreased survival»
Insulin resistance has been linked to an increased risk and decreased survival rate from many cancers. (ultrawellnesscenter.com)
In fact, protein restriction can have negative consequences because pets can lose valuable muscle mass, which can lead to decreased survival times. (1800petmeds.com)
That's not as bad as decreasing survival, of course. (statnews.com)