A compound attribute that is the ratio of amount of complement C1q tumor necrosis factor-related protein 1 (human) in blood to amount of von Willebrand factor (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2053177 (C1QTNF1/VWF protein level ratio in blood). Also known as: the ratio of amount of complement C1q tumor necrosis factor-related protein 1 (human) in blood to amount of von Willebrand factor (human) in blood.