In predicting COVID-19 mortality, Fig. 7A shows the area under the curve for each individual factor, including patient age (AUC: 0.65, p-value = 0.001), baseline severity (AUC: 0.837, p-value < 0.01), baseline D-dimer (AUC: 0.827, p-value < 0.01), and baseline IL-6 (AUC: 0.856, p-value < 0.01). Here, IL6 is linked to COVID-19.