A compound attribute that is the ratio of amount of death domain-containing protein CRADD (human) in blood to amount of proepiregulin (human) in blood. The trait is CRADD/EREG protein level ratio in blood (Ontology of Biological Attributes entry OBA_2054515). Also known as: the ratio of amount of death domain-containing protein CRADD (human) in blood to amount of proepiregulin (human) in blood.