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Table 2 Data are number of patients (% of group total) positive for each category. Incidence of KDIGO AKI stages 1–3 in cardiac surgery and ICU was determined using SCr alone vs two methods of measuring urine output (UO). KDIGO stage 1 was increase in SCr by ≥0.3 mg/dl [≥26.5 mol/l] within 48 h or increase in SCr to 1.5–1.9 times baseline or urine volume < 0.5 ml/kg/h for 6–12 h, stage 2 was increase in SCr to 2.0–2.9 times baseline or urine volume < 0.5 ml/kg/h for ≥12 h, stage 3 was SCr > 3.0 times baseline or initiation of renal replacement therapy or urine volume < 0.3 ml/kg/h for ≥24 h or anuria for ≥12 h. UOcons required urine volume to meet KDIGO criteria for each consecutive hour over any 6, 12 or 24 h period. UOmean was mean urine volume meeting KDIGO criteria over any 6, 12 or 24 h period

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

 SCr/RRT aloneUOcons + SCrUOmean + SCr
Cardiac Surgery (n = 151)ICU (n = 150)Cardiac Surgery (n = 151)ICU (n = 150)Cardiac Surgery (n = 151)ICU (n = 150)
Stage 124 (15.9)22 (14.6)46 (30.5)42 (28)47 (31.1)29 (19.3)
Stage 23 (1.98)11 (7.3)5 (3.3)19 (12.7)54 (35.8)55 (36.7)
Stage 39 (6)15 (10)9 (6)16 (10.7)9 (6)20 (13.3)
All AKI36 (23.8)48 (32)60 (39.7)77 (51.3)110 (72.8)104 (69.3)