Fig. 2

Receiver operating characteristic (ROC) analysis of C-reactive protein (CRP) level for respiratory failure. The cutoff value of CRP level for the presence of respiratory failure was determined by the ROC analysis. The cutoff value of CRP level was 2.75 mg/dL, with an area under the curve (AUC) of 0.744, sensitivity of 0.611, and specificity of 0.923