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
| UOcons | UOmean | |||
|---|---|---|---|---|
| Cardiac Surgery (n = 151) | ICU (n = 150) | Cardiac Surgery (n = 151) | ICU (n = 50) | |
| Number patients with AKI | 46 (30.5) | 55 (36.7) | 104 (68.9) | 72 (48) |
| Sensitivity | 0.61 (0.45–0.77) | 0.58 (0.44–0.72) | 0.83 (0.71–0.95) | 0.67 (0.53–0.80) |
| Specificity | 0.79 (0.71–0.86) | 0.73 (0.63–0.81) | 0.36 (0.26–0.44) | 0.45 (0.35–0.54) |
| PPV | 0.48 (0.33–0.62) | 0.50 (0.36–0.63) | 0.29 (0.20–0.37) | 0.36 (0.26–0.46) |
| NPV | 0.87 (0.80–0.93) | 0.79 (0.70–0.86) | 0.87 (0.77–0.96) | 0.74 (0.63–0.85) |