Fig. 5From: Development and validation of a nomogram to predict failure of 14-day negative nucleic acid conversion in adults with non-severe COVID-19 during the Omicron surge: a retrospective multicenter studyThe calibration and ROC curves of the nomogram. The ROC and calibration curves for performance to distinguish individuals with VST > 14 days from with VST ≤ 14 days in the training set (A, D), validation set (B, E), and external validation set (C, F), respectively. AUC area under the ROC curve, ROC receiver operating characteristic, VST viral shedding timeBack to article page