For diagnosing asthma severity, the AUC of the miR-1 expression level was the highest (AUC = 0.977, P < 0.05), followed by the IL-4 level (AUC = 0.963, P < 0.05) and the IFN-γ level (AUC = 0.885, P < 0.05) (Table 5 and Figure 2). Here, IL4 is linked to asthma.