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Kaplan–Meier survival curves by age groups. (A) Survival curve: 67- to 79-years age group. (B) Survival curve: 80- to 89-years age group (octogenarians). (C) Survival curve: ≥90-years age group. Note that there was a statistically significant difference between AVF and AVG in the 67–79 group but a nonsignificant difference in the 80–89 group.
