CEACAM5 and COVID-19: After adjustment to age, sex, and smoking history, the binary logistic regression equation (Model 3) demonstrated that the risk of COVID-19 death increased 1.002 times for each additional 1 mg/L ferritin level (OR = 1.002, 95% CI: 1.001–1.003) and 1.317 times for each additional 1 ng/ml CEA level (OR = 1.317, 95% CI: 1.099–1.579).