A compound attribute that is the ratio of amount of cathepsin F (human) in blood to amount of N-acylethanolamine-hydrolyzing acid amidase (human) in blood. The trait is CTSF/NAAA protein level ratio in blood (Ontology of Biological Attributes entry OBA_2054621). Also known as: the ratio of amount of cathepsin F (human) in blood to amount of N-acylethanolamine-hydrolyzing acid amidase (human) in blood.