A compound attribute that is the ratio of amount of 2,4-dienoyl-CoA reductase [(3E)-enoyl-CoA-producing], mitochondrial (human) in blood to amount of frataxin, mitochondrial (human) in blood. The trait is DECR1/FXN protein level ratio in blood (OBA_2054076, an Ontology of Biological Attributes id). Also known as: the ratio of amount of 2,4-dienoyl-CoA reductase [(3E)-enoyl-CoA-producing], mitochondrial (human) in blood to amount of frataxin, mitochondrial (human) in blood.