CXCL8 and coronary artery disorder: Ultimately, we achieved (see quality assessment in methods section) the final model that includes nine features (i.e., gender score, age, frailty index, IL-1β, IL-18, IL-8, IL-23, IL-12p70, IL-33) and that could discriminate between obstructive and non-obstructive CAD with 83% accuracy and 87% precision (Fig. 5).