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

Figure 2

Risk factors of DR nomogram (code of sex [1: male, 2: female]). (To use the nomogram, an individual patient’s value is located on each variable axis, and a line is drawn upward to determine the number of points received for each variable value. The sum of these numbers is located on the total points’ axis, and a line is drawn downward to the risk of DR’s axes to determine DR risk.)