ALB and acute kidney injury: Compared to the normal group (reference), the risk of renal failure increased by the albumin level decline: the HRs were 2.99 (95% CI, 1.36-6.61, p = 0.007) for the mild group, 6.03 (95% CI, 3.05-11.95, p < 0.001) for the moderate group, and 13.74 (95% CI, 6.63-28.44, p < 0.001) for the severe group.