A compound attribute that is the ratio of amount of insulin-like growth factor-binding protein 6 (human) in blood to amount of SPARC-related modular calcium-binding protein 2 (human) in blood. The trait is IGFBP6/SMOC2 protein level ratio in blood (OBA_2054358). Also known as: the ratio of amount of insulin-like growth factor-binding protein 6 (human) in blood to amount of SPARC-related modular calcium-binding protein 2 (human) in blood.