Table 4.

Selected comparisons of the areas under the receiver operating characteristic curves

	Difference in AUC*	95% CI	P value
eGFR calculated using cystatin C versus eGFR calculated using CKD-EPI equation	0.0390	0.0077 to 0.0703	0.0145
eGFR calculated using combined creatinine and cystatin C versus eGFR calculated using CKD-EPI equation	0.0344	0.0146 to 0.0542	0.0007
eGFR calculated using cystatin C versus eGFR calculated using combined creatinine and cystatin C	0.0047	−0.0088 to 0.0181	0.4954
EuroSCORE versus eGFR calculated using CKD-EPI equation	0.0569	0.0161 to 0.0976	0.0062
EuroSCORE versus eGFR calculated using cystatin C	0.0180	−0.0205 to 0.0565	0.3589
EuroSCORE versus eGFR calculated using combined creatinine and cystatin C	0.0226	−0.0156 to 0.0608	0.2469

*Slight differences from those calculable from table 3 are due to nine patients with missing cystatin C levels.

AUC, area under curve; CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration; eGFR, estimated glomerular filtration rate; EuroSCORE, European System for Cardiac Operative Risk Evaluation.