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. UO^cons required urine volume < 0.5 ml/kg/h each consecutive hour for ≥6 h. UO^mean 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