CRP and coronary artery disorder: The logistic regression analysis, including age, history of ischemic heart disease and chronic pulmonary disease, D-dimer and C-reactive protein at admission, PaO2/FiO2, RR, mROX, A-a O2 gradient, and HACOR score at T1 as independent variables, showed that the only parameter significantly associated with CPAP failure was the HACOR score (odds ratio—OR—for every unit increase in HACOR = 1.361; 95%CI:1.103–1.680; p=0.004; AUROC = 0.742; p < 0.001) (Figure 1).