Fig. 2.

Predictive value of biomarkers and their corresponding models. ROC curves of endostatin, NGAL, cystatin C and their corresponding models for predicting failure to recover in derivation cohort. a AUCs of endostatin, NGAL and cystatin C alone for prediction. b AUCs of biomarker–clinical risk prediction models for prediction. ROC receiver operating characteristic, AUC area under the ROC, NGAL neutrophil gelatinase-associated lipocalin