A compound attribute that is the ratio of amount of neutrophil collagenase (human) in blood to amount of matrix metalloproteinase-9 (human) in blood. The trait is MMP8/MMP9 protein level ratio in blood (OBA_2054573). Also known as: the ratio of amount of neutrophil collagenase (human) in blood to amount of matrix metalloproteinase-9 (human) in blood.