Fig. 1

Receiver operating characteristic (ROC) curves indicating the additive effects of GA parameters on mean HbA1c. Two ROC curves were adjusted for age, sex, duration of diabetes, total cholesterol, fasting c-peptide, use of insulin, use of anti-hypertensive drugs, and smoking status. a Compares the predictive values between mean HbA1c (dashed line) and mean HbA1c plus mean GA (straight line). b Compares the predictive values between mean HbA1c (dashed line) and mean HbA1c plus %CV of GA (straight line)