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Table 4 Relation between length of longest episode of oliguria during an ICU day at risk (patient day without a diagnosis of RIFLE I[Cr]) and AKI-Cr in the next two days

From: Oliguria as predictive biomarker of acute kidney injury in critically ill patients

Longest duration of oliguria Days with AKI-Cr next 2 days Days with no AKI-Cr next 2 days Sens. Spec. PPV NPV LR P RR of AKI
None 9 439        
≥1 hr 26 249 0.74 0.63 0.09 0.98 2.1 < 0.001 4.7
≥2 hr 22 187 0.62 0.72 0.10 0.97 2.3 < 0.001 4.2
≥3 hr 18 120 0.51 0.83 0.13 0.97 2.9 < 0.001 4.5
≥4 hr 17 90 0.49 0.87 0.16 0.97 3.7 < 0.001 5.4
≥5 hr 10 72 0.29 0.90 0.12 0.96 2.7 0.004 3.1
≥6 hr 6 49 0.17 0.93 0.11 0.96 2.4 0.04 2.5
≥12 hr 4 9 0.11 0.99 0.31 0.96 8.7 0.002 7.0
  1. Receiver-operator characteristic area under the curve for this comparison = 0.72 (0.63-0.81). P-values refer to Fisher's exact test for presence or absence of stated degree of oliguria and AKI outcome.
  2. AKI-Cr, acute kidney injury defined by changes in serum creatinine; LR, likelihood ratio (positive); NPV, negative predictive value; PPV, positive predictive value; Sens, sensitivity; Spec, specificity; RR, relative risk.