Figure 3: A Kaplan-Meier curve for event free obtained from the late referral patients and the total population. The incidence-free rates at 1 year and 3 years were 94% and 80% in the total population and those at 1 year and 3 years were 94% and 64% in the late nephrology referral patients. There was a significant difference between the two groups (P<0.05).