Performance characteristics of urine and plasma miR-21 as prognostic AKI biomarkers among patients with AKI at the time of sample collection (n = 80).

PPV, positive predictive value; NPV, negative predictive value; RRT, renal replacement therapy; AKIN, Acute Kidney Injury Network; ICU, intensive care unit. aThe percentage and number of patients who were above and equal to the best PPV cut-off. bDeath defined as 30 day in-hospital mortality. cDefined as discharge >10 days from sample collection. dDefined as length of ICU stay >4 days.