Degree of Acute Kidney Injury before Dialysis Initiation and Hospital Mortality in Critically Ill Patients

Table 3

Mortality risk in AKI requiring dialysis patients by degree of severity of kidney injury.

Groups by severity of injury before dialysis initiation	N	SMR (95% CI)	Odds ratio (95% CI)
Overall AKI requiring dialysis	2,744	1.68 (1.60–1.76)
No creatinine increase before dialysis (Grp IV)	308	0.98 (0.78–1.20)	0.39 (0.29–0.52)
Group I (0.3 mg/dL to <2 times increase)	1,006	1.40 (1.29–1.52)	Reference
Group II (≥2 to <3 times increase)	574	1.84 (1.66–2.04)	1.76 (1.40–2.22)
Group III (>3 times increase)	856	2.25 (2.07–2.45)	2.20 (1.79–2.71)

AKI: acute kidney injury; SMR: standardized mortality rate; 95% CI: 95% confidence intervals.