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The relationship between serum BNP and AKI (at least mild AKI, panels A and B; severe AKI, panels C and D) by spline regression modeling. Serum BNP was log-transformed in B and d. The curves represent restricted cubic splines with knots estimated by the arrows on the abscissa. Triangles denote the empirical logits. Abbreviations: Acute kidney injury (AKI), brain natriuretic peptide (BNP)
