Figure 3: ROC curve analysis and cut off value among the training set and the validation set by HCMV-miR-US4-1 and HCMV-miR-UL-148D.

(a) ROC curve of HCMV-miR-US4-1 as biomarker (AUC = 1.00). (b) ROC curve of HCMV-miR-UL-148D as biomarker (AUC = 0.96). (c) A scatter diagram showing the absolute concentration of HCMV-miR-US4-1 with the cutoff point at 289.58 fmol/L. (d) A scatter diagram displaying the absolute concentration of HCMV-miR-UL148D with the cutoff point at 64.68 fmol/L.