To explore the risk factors of endometrial lesions in patients with abnormal uterine bleeding and establish prediction models which can discriminate between different endometrial etiologies of abnormal uterine bleeding(AUB).
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Inclusion Criteria: * 1\) non-pregnancy related abnormal uttering bleeding(AUB) in women of 18-60 years old; 2)women who had indications for hysteroscopy and endometrial histology in the study period Exclusion Criteria: * 1\) postmenopausal women, 2) AUB due to other causes such as hormones or medications, coagulation disorders, and vascular malformation of the uterus; 3) final diagnosis outside the scope of this study.