CRP and acute kidney injury: As compared to CRP, the NRI and IDI of NRBC count were 0.173 (95%CI: 0.052 to 0.294; p = 0.005) and 0.885 (95% CI: 0.557 to 1.210; p < 0.001), respectively, indicating significant enhancement of NRBC count in prediction of AKI.