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Table 3 Sensitivity, specificity, positive predictive value and negative predictive value (95% CI) were calculated using 2 × 2 tables of frequencies. KDIGO SCr criteria were applied (Increase in SCr by ≥0.3 mg/dl[≥26.5 mol/l] within 48 h or increase in SCr to ≥1.5 times baseline (which is known or presumed to have occurred within the prior 7 days)) as gold standard for diagnosing AKI. AKI by urine output was defined using KDIGO criteria as urine volume < 0.5 ml/kg/h for 6 h. UOcons required urine volume < 0.5 ml/kg/h each consecutive hour for ≥6 h. UOmean was mean urine volume < 0.5 ml/kg/h over any > 6 h period

From: Definition of hourly urine output influences reported incidence and staging of acute kidney injury

 UOconsUOmean
 Cardiac Surgery (n = 151)ICU (n = 150)Cardiac Surgery (n = 151)ICU (n = 50)
Number patients with AKI46 (30.5)55 (36.7)104 (68.9)72 (48)
Sensitivity0.61 (0.45–0.77)0.58 (0.44–0.72)0.83 (0.71–0.95)0.67 (0.53–0.80)
Specificity0.79 (0.71–0.86)0.73 (0.63–0.81)0.36 (0.26–0.44)0.45 (0.35–0.54)
PPV0.48 (0.33–0.62)0.50 (0.36–0.63)0.29 (0.20–0.37)0.36 (0.26–0.46)
NPV0.87 (0.80–0.93)0.79 (0.70–0.86)0.87 (0.77–0.96)0.74 (0.63–0.85)