A compound attribute that is the ratio of amount of interleukin-1 receptor type 1 (human) in blood to amount of interleukin-1 receptor antagonist protein (human) in blood. The trait is IL1R1/IL1RN protein level ratio in blood (OBA_2054428). Also known as: the ratio of amount of interleukin-1 receptor type 1 (human) in blood to amount of interleukin-1 receptor antagonist protein (human) in blood.