Predictive value of serum cystatin C for risk of mortality in severe and critically ill patients with COVID-19

Figure 1 Receiver operating characteristic curve of serum cystatin C for predicting the risk of mortality in severe and critically ill patients with coronavirus disease 2019. Area under the curve, optimal threshold, specificity, and sensitivity were 0.755, 0.80, 0.562, and 0.865, respectively.

Figure 2 Effect of serum cystatin C level on patient survival. The Kaplan-Meier survival curves for severe and critically ill coronavirus disease 2019 patients with a cut-off value of serum cystatin C at 0.80 mg/L are shown.