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Relationship between AKI severity, AKD stage, and 30-day outcome after AKI. (A). AKD stage stratified by AKI severity; (B). 30-day outcomes stratified by AKD stage. All comparisons were performed using the chi-square test. AKD, acute kidney disease; AKI, acute kidney injury; KDIGO, Kidney Disease Improving Global Outcomes criteria; RRT, renal replacement therapy.
