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Table 3 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 the next day

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

Longest duration of oliguria Days with AKI-Cr next day Days with no AKI-Cr next day Sens. Spec. PPV NPV LR P RR of AKI-Cr
None 5 443        
≥1 hr 18 257 0.78 0.63 0.07 0.99 2.1 < 0.0001 5.9
≥2 hr 15 194 0.65 0.72 0.07 0.98 2.4 0.0003 4.6
≥3 hr 13 125 0.57 0.82 0.09 0.98 3.2 < 0.0001 5.5
≥4 hr 12 95 0.52 0.86 0.11 0.98 3.8 < 0.0001 6.3
≥5 hr 7 75 0.30 0.89 0.09 0.98 2.8 0.01 3.4
≥6 hr 5 50 0.21 0.93 0.09 0.97 3.1 0.02 3.8
≥12 hr 4 9 0.17 0.99 0.31 0.97 13.5 0.0005 11.5
  1. 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; hr, hours; LR, likelihood ratio (positive); NPV, negative predictive value; PPV, positive predictive value; Sens, sensitivity; Spec, specificity; RR, relative risk.