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Box plots showing the relationship between the grading of diastolic dysfunction and the natural logarithm of intact fibroblast growth factor 23 (FGF23) in 47 hemodialysis patients. Elevated levels of natural log–transformed intact FGF23 were significantly associated with a higher grade of left ventricular diastolic dysfunction (R2 = 0.51; 95% confidence interval for slope, 1.7–3.4; P < 0.001).
