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Receiver operating characteristic curve analysis for RDW showed an area under the curve of 0.644 (CI 0.51 to 0.76; p = 0.046) (A). RDW values in the highest quartile (>16.2%) were associated with a significantly reduced AVF patency rate at 24 months after surgery (p = 0.036). The Kaplan-Meier curves were compared with the log-rank test (B).
