A compound attribute that is the ratio of amount of forkhead box protein O1 (human) in blood to amount of signal transducer and activator of transcription 5B (human) in blood. The trait is FOXO1/STAT5B protein level ratio in blood (OBA_2054149). Also known as: the ratio of amount of forkhead box protein O1 (human) in blood to amount of signal transducer and activator of transcription 5B (human) in blood.