3.4 NLR prediction of heavy group COVID-19 pneumonia and
critical value judgment
Using the ROC curve to calculate the area under the NLR curve, the
results showed that: AUC was 0.831 (95% CI
0.730~0.932), the Youden index was the largest 0.589,
corresponding to the best cut-off value of 4.795, the sensitivity was
0.839, and the specificity was 0.750 (Figure 1).