A method of treating an inflammatory condition in a patient with a statin, the method comprising assessing the efficacy of the statin for use in the treatment of the inflammatory condition in the patient wherein the inflammatory condition is cardiovascular disease (CVD) or rheumatoid arthritis, wherein said assessing comprises measuring the levels of at least one 13-series resolvin in biological samples obtained from the patient before and after administration of the statin, wherein an increase in the level of the resolvin after administration of the statin is indicative of efficacy of the statin, and administering the statin to the patient.