IL11RA and COVID-19: Moreover, the best cutoff values were 15.95 for IL11RA mRNA (AUC = 0.803) and 40.5 for LncRNA RP11-773H22.4 (AUC = 0.777), and these could be used to differentiate mild from severe COVID-19 cases, with sensitivities of 73.2% and 78% and specificity values of 76% and 71%, respectively (Table 3, Figure 4).