GSTM1 and diabetes mellitus: Meanwhile, some other potential risk factors were showed differences significantly between VTE patients and non-VTE patients, such as postoperative hemoglobin (Hb), postoperative D-dimer, postoperative/preoperative D-dimer, Caprini score, operation duration, diabetes mellitus, history of surgery (<1 month), history of VTE, and postoperative bladder hematoma (Table 1).