Serum Extracellular Superoxide Dismutase Is Associated with Diabetic Retinopathy Stage in Chinese Patients with Type 2 Diabetes Mellitus

Figure 3

Receiver operating characteristic (ROC) curve of serum ecSOD activity in identification of T2DM patients with DR (a), NPDR (b), and PDR (c).

(a)

(b)

(c)