Correlation between the AKI classification and outcome

Table 3 Differences between AKI III on RRT and AKI III without RRT.

Factor	AKI III on RRT (n = 1847)	AKI III without RRT (n = 935)	p
Male gender	1242 (67.2%)	660 (70.6%)	0.08
Age
Mean (SD)	60.09 (15.68)	63.14 (15.42)	0.28
APACHE II on admission to ICU
Median (range)	22 (1 to 52)	19 (2 to 46)	< 0.0001
Mean (SD)	22.92 (7.80)	19.84 (6.63)
SOFA score on admission to ICU
Median (range)	10 (0 to 22)	7 (0 to 17)	0.0063
Mean (SD)	10.23 (3.18)	7.61 (2.96)
Organ failure on admission to ICU*
Median (range)	2 (0 to 6)	1 (0 to 4)	< 0.0001
Mean (SD)	1.72 (1.20)	1.11 (0.95)
Maximum organ failure during ICU*
Median (range)	2 (0 to 6)	2 (0 to 6)	< 0.0001
Mean (SD)	2.27 (1.17)	1.67 (0.97)
Mechanical ventilation	1687 (91.3%)	729 (77.97%)	< 0.0001
Pre-existing chronic illness	469 (25.4%)	238 (25.5%)	0.97
Haemoglobin ≤ 9 g/dl on admission to the ICU	496 (26.9%)	193 (20.6%)	0.0004
Cardiac surgery	236 (12.8%)	95 (10.2%)	0.051
Mortality
ICU mortality	999 (54.1%)	380 (40.6%)	< 0.0001
Hospital mortality	1138 (61.6%)	472 (50.5%)	< 0.0001

* excluding acute kidney injury
AKI = acute kidney injury; APACHE = Acute Physiology and Chronic Health Evaluation; ICU = intensive care unit; RRT = renal replacement therapy; SD = standard deviation; SOFA score = Sequential Organ Failure Assessment score.

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