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Unadjusted Kaplan-Meier survival curves by AKIN categories are shown. Time is calculated from 90 d after discharge of the index admission. AKIN categories are defined by the ratio of the highest creatinine to the lowest creatinine. AKIN I is a ratio ≥1.5 and <2, AKIN II is a ratio ≥2 and <3, and AKIN III is a ratio ≥3. Log-rank test: P < 0.001.
