Table 3 Prevalence of AKIuo and AKIc (percentage of all patients classified in that category) in different FENa and FEUrea quartiles

From: Urinary output and fractional excretion of sodium and urea as indicators of transient versus intrinsic acute kidney injury during early sepsis

FENa quartiles	AKIuo d0t0 P = 0.05	AKIuo d0t4 P < 0.001	AKIuo d1 P = 0.18
<0.15	57.7	72.4	53.3
0.15-0.36	48.1	34.6	46.7
0.36-0.95	33.3	39.1	33.3
>0.95	23.1	14.3	28.1
FEUrea quartiles	AKIuo d0t0 P = 0.01	AKIuo d0t4 P < 0.001	AKIuo d1 P = 0.01
<21	59.3	77.8	83.3
21-31.5	48.1	55.5	38.1
31.5-42	37.5	22.2	30
>42	17.9	23.5	34.1
FENa quartiles	AKIc d0t0 P = 0.76	AKIc d0t4 P = 0.66	AKIc d1 P = 0.09
<0.15	34.6	37.9	33.3
0.15-0.36	40.7	46.2	40
0.36-0.95	48.1	34.8	29.6
>0.95	46.2	50	59.4
FEUrea quartiles	AKIc d0t0 P = 0.06	AKIc d0t4 P = 0.17	AKIc d1 P = 0.72
<21	55.6	61.1	33.3
21-31.5	51.9	44.4	33.3
31.5-42	20.8	44.4	46.7
>42	39.3	29.4	43.9

P values represent χ² over the quartiles.

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