The erythrocyte Omega-3 Index (EPA + DHA) (a), the ratio of arachidonic acid (20:4n ā 6) to the Omega-3 Index (EPA + DHA) (b), and the 20:3/18 ratio, an index of delta6-desaturase activity (c), in female and male and healthy controls (HC) and SZ patients. Values are group means SEM. *, ** versus same-gender healthy controls.