Characterization of Participants
Total 180 patients were included in the study, who underwent fractional dilatation and curettage or hysterectomy (Table 1 ). Patients came to hospital mostly due to irregular vaginal bleeding (80.5%) and discharge (3.9%), abdominal pain (3.9%), or endometrial abnormality revealed by imaging tests (3.9%). The age of participants ranged from 23 to 81 years, averagely 49.89 years. There were 23.9% patients with anemia, 9.4% with hypertension, 2.2% with diabetes, and some with other endocrine metabolic diseases.