A compound attribute that is the ratio of amount of dual adapter for phosphotyrosine and 3-phosphotyrosine and 3-phosphoinositide (human) in blood to amount of syndecan-4 (human) in blood. The trait is DAPP1/SDC4 protein level ratio in blood (Ontology of Biological Attributes entry OBA_2055076). Also known as: the ratio of amount of dual adapter for phosphotyrosine and 3-phosphotyrosine and 3-phosphoinositide (human) in blood to amount of syndecan-4 (human) in blood.