A compound attribute that is the ratio of amount of cyclin-dependent kinase inhibitor 1 (human) in blood to amount of F-box-like/WD repeat-containing protein TBL1X (human) in blood. The trait is CDKN1A/TBL1X protein level ratio in blood (Ontology of Biological Attributes term OBA_2055449). Also known as: the ratio of amount of cyclin-dependent kinase inhibitor 1 (human) in blood to amount of F-box-like/WD repeat-containing protein TBL1X (human) in blood.