Additionally, the maximal IL-6 level (cutoff = 80 pg/mL) predicted respiratory failure with high accuracy (p = 1.7 × 10−8, AUC = 0.98), and patients with IL-6 levels higher than 80 pg/mL had 22 times higher odds of respiratory failure than those with normal IL-6 levels (Herold et al. 2020a). Here, IL6 is linked to respiratory failure.