A compound attribute that is the ratio of amount of insulin-like growth factor-binding protein 6 (human) in blood to amount of neuroblastoma suppressor of tumorigenicity 1 (human) in blood. The trait is Ontology of Biological Attributes id OBA_2054356 (IGFBP6/NBL1 protein level ratio in blood). Also known as: the ratio of amount of insulin-like growth factor-binding protein 6 (human) in blood to amount of neuroblastoma suppressor of tumorigenicity 1 (human) in blood.