A compound attribute that is the ratio of amount of cyclin-dependent kinase inhibitor 1 (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood. The trait is CDKN1A/HBEGF protein level ratio in blood (OBA_2055444). Also known as: the ratio of amount of cyclin-dependent kinase inhibitor 1 (human) in blood to amount of proheparin-binding EGF-like growth factor (human) in blood.