Figure legends
Figure.1 Study profile
Figure. 2 Time to Clinical Improvement analysis in different D-Dimer levels when anticoagulant therapy was initiated. The differences of improvement in two groups were observed both within 7 days (P=0.24) and 14 days (P=0.03).
Figure. 3 The time to the first appearance of improvement with chest CT and patients’ hospital stays between two groups. The mean days at the time of CT imaging improvement were 12.1±3.6 days in the group of D-Dimer≤3, while 16.2±6.4 days in D-Dimer>3 (p=0.028). The hospital stays in the two groups were 27 (25.5-30.5) days and 28 (27-36.5) days separately (p=0.086).