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Table 1 KDIGO-based acute kidney injury criteria for this study (as described in [20])

From: Acute kidney injury as an independent risk factor for unplanned 90-day hospital readmissions

AKI criteria Definition
Index AKI episode (lasting up to 90 days in duration) Serum creatinine ≥1.5 times higher than the median of all creatinine values 8-90 days ago; or 91–365 days ago if no tests between 8 and 90 days;
or serum creatinine ≥1.5 times higher than the lowest creatinine within 7 days;
or serum creatinine >26 μmol/L higher than the lowest creatinine within 48 h
Prior AKI episode Any episode occurring 91-1095 days prior to index episode