Figure 2: A Kaplan-Meier curve for event free obtained from the patients with or without diabetic nephropathy. The incidence-free rates at 1 year and 3 years were 88% and 80% in the patients without diabetic nephropathy and those were 87% and 38% in the patients with diabetic nephropathy, respectively. There is a significant difference between the two groups (log rank test; P=0.003).