A compound attribute that is the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood. The trait is APP/EGF protein level ratio in blood (Ontology of Biological Attributes term OBA_2053911). Also known as: the ratio of amount of amyloid-beta precursor protein (human) in blood to amount of pre-pro-epidermal growth factor (human) in blood.