A compound attribute that is the ratio of amount of islet cell autoantigen 1 (human) in blood to amount of thioredoxin-dependent peroxide reductase, mitochondrial (human) in blood. The trait is ICA1/PRDX3 protein level ratio in blood (Ontology of Biological Attributes identifier OBA_2052979). Also known as: the ratio of amount of islet cell autoantigen 1 (human) in blood to amount of thioredoxin-dependent peroxide reductase, mitochondrial (human) in blood.