A compound attribute that is the ratio of amount of forkhead box protein O1 (human) in blood to amount of forkhead box protein O3 (human) in blood. The trait is OBA_2054142 (FOXO1/FOXO3 protein level ratio in blood). Also known as: the ratio of amount of forkhead box protein O1 (human) in blood to amount of forkhead box protein O3 (human) in blood.