Table 2.

Characteristics of serum creatine stratified by AKI stage

Characteristics among All Patients with AKIAny AKI, n=1655AKI Stage 1, n=961 (58%)AKI Stage 2, n=223 (13%)AKI Stage 3, n=270 (16%)AKI KRT, n=201 (12%)
Baseline serum creatinine
 Mean (SD), mg/dl1.4 (0.5)1.3 (0.4)1.1 (0.3)1.5 (0.7)1.5 (0.6)
 Median (IQR), mg/dl1.2 (1.0–1.5)1.2 (1.0–1.5)1.1 (1.0–1.3)1.3 (1.0–1.8)1.4 (1.1–1.7)
AKI within 1 d of hospitalization, no. (%)1318 (80)837 (87)153 (69)196 (73)132 (66)
Characteristics among discharged patientsa with AKIAny AKI, n=989AKI Stage 1, n=709 (72%)AKI Stage 2, n=125 (13%)AKI Stage 3, n=96 (10%)AKI KRT, n=59 (6%)
 Baseline serum creatinine
  Mean (SD), mg/dl1.3 (0.5)1.3 (0.4)1.1 (0.3)1.8 (0.8)1.6 (0.7)
  Median (IQR), mg/dl1.2 (1.0–1.6)1.2 (1.0–1.5)1.1 (1.0–1.4)1.4 (1.1–2.5)1.5 (1.2–1.8)
 Peak serum creatinine
  Mean (SD), mg/dl2.5 (1.8)1.9 (0.6)2.7 (0.6)5.4 (2.4)5.3 (3.7)
  Median (IQR), mg/dl2.0 (1.6–2.8)1.7 (1.5–2.2)2.7 (2.2–3.1)4.7 (4.1–6.0)4.4 (2.8–6.9)
 Time to peak serum creatinine
  Mean (SD), d2 (4)1 (3)3 (5)4 (6)5 (5)
  Median (IQR), d0 (0–2)0 (0–1)0 (0–3)1 (0–7)3 (1–7)
 Time to AKI
  Mean (SD), d1 (2)1 (2)1 (2)1 (3)1 (3)
  Median (IQR), d0 (0–0)0 (0–0)0 (0–0)0 (0–0)0 (0–1)
 Discharge serum creatinineb
  Mean (SD), mg/dl1.7 (1.5)1.3 (0.5)1.3 (0.5)2.8 (2.0)5.0 (3.6)
  Median (IQR), mg/dl1.2 (1.0–1.8)1.2 (0.9–1.5)1.1 (0.9–1.5)2.1 (1.4–3.8)4.2 (2.5–6.9)
 Discharge serum creatinine > baseline, no. (%)460 (47)275 (39)62 (50)74 (77)49 (83)
 Discharge serum creatinine > baseline +0.3 mg/dl, no. (%)208 (21)79 (11)29 (23)53 (55)47 (80)
  • IQR, interquartile range.

  • a Excluding those patients who died and those still under treatment.

  • b In those who received KRT, serum creatinine was censored at initiation of dialysis.