Table 2.

Characteristics of serum creatine stratified by AKI stage

Characteristics among All Patients with AKI	Any AKI, n=1655	AKI 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/dl	1.4 (0.5)	1.3 (0.4)	1.1 (0.3)	1.5 (0.7)	1.5 (0.6)
Median (IQR), mg/dl	1.2 (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 patients^a with AKI	Any AKI, n=989	AKI 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/dl	1.3 (0.5)	1.3 (0.4)	1.1 (0.3)	1.8 (0.8)	1.6 (0.7)
Median (IQR), mg/dl	1.2 (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/dl	2.5 (1.8)	1.9 (0.6)	2.7 (0.6)	5.4 (2.4)	5.3 (3.7)
Median (IQR), mg/dl	2.0 (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), d	2 (4)	1 (3)	3 (5)	4 (6)	5 (5)
Median (IQR), d	0 (0–2)	0 (0–1)	0 (0–3)	1 (0–7)	3 (1–7)
Time to AKI
Mean (SD), d	1 (2)	1 (2)	1 (2)	1 (3)	1 (3)
Median (IQR), d	0 (0–0)	0 (0–0)	0 (0–0)	0 (0–0)	0 (0–1)
Discharge serum creatinine^b
Mean (SD), mg/dl	1.7 (1.5)	1.3 (0.5)	1.3 (0.5)	2.8 (2.0)	5.0 (3.6)
Median (IQR), mg/dl	1.2 (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.