Table 4.

Risk-adjusted change in mortality associated with acute kidney injury.

	90 day mortality		Hospital mortality

	Risk-adjusted relative mortality ratio (95% CI)	Risk-adjusted mean % (95% CI)	Risk-adjusted relative mortality ratio (95% CI)	Risk-adjusted mean % (95% CI)
Patients with no acute kidney injury	1 (Reference)	4.4 (4.0, 4.7)	1 (Reference)	2.1 (1.8, 2.4)
Patients with any acute kidney injury	1.65 (1.48, 1.84)^a	6.5 (6.2, 6.8)^a	2.38 (2.00, 2.84)^a	4.2 (4.0, 4.4)^a
Acute kidney injury, Stage RIFLE-R	1.30 (1.15, 1.47)^a	4.8 (4.5, 5.2)^a	1.71 (1.41, 2.08)^a	2.8 (2.5, 3.1)^a
Acute kidney injury, Stage RIFLE-I	1.88 (1.64, 2.16)^a	6.5 (6.0, 7.0)^a	2.33 (1.90, 2.84)^a	3.6 (3.2, 3.9)^a
Acute kidney injury, Stage RIFLE-F	3.49 (3.01, 4.05)^a	10.5 (9.7, 11.3)^a	5.53 (4.52, 6.77)^a	6.8 (6.3, 7.3)^a

Abbreviations. CI, confidence interval.

The risk-adjusted relative mortality ratios and mean percentages were derived using generalized linear models adjusted for age, gender, ethnicity, primary payer, Charlson Comorbidity Index, surgery type, emergent surgery status, weekend admission, estimated GFR (glomerular filtration rate), and all postoperative complications.

P-value < 0.001 using generalized linear models to compare to no acute kidney injury group.