PON1 and diabetes mellitus: Other biochemical parameters, including glucose, total cholesterol, HDL-C, LDL-C, triglycerides, HbA1c and clinical/demographic data, were measured in the routine blood chemistry laboratory and retrieved from patient files.<h4>Results</h4>Serum PON1 activity was significantly lower in patients with DM (31.6 [21.49-48.45] U/mL) compared to controls (41.08 [29.07-54.35] U/mL) (p= 0.028).