GPT and respiratory failure: Through stepwise logistic regression, we finally selected 24 variables, which were age, gender, BMI, previous history of VTE, history of cancer, cancer, respiratory failure, heart failure, sepsis, hematocrit, hemoglobin, platelet count, white blood cell count, albumin, serum creatinine, INR, PT, PTT, total bilirubin, ALT, AST, transfusion of packed red blood cells, mechanical ventilation, and CVC.