[Epidemiological study on risk factors of pelvic endometriosis]

In order to study the risk factors associated with pelvic endometriosis, a case-control study was carried out from Mar. 1991 to Feb. 1993 in our gynecological ward. A total of 190 cases with endometriosis and 192 patients with non-endometriosis diseases (control group) were interviewed. Single factor analysis indicated that risk factors related to endometriosis were menorrhagia (OR = 3.09), short menstrual cycle (< 27 days) (OR = 1.89), complicated with uterine leiomyoma and (or) adenomyosis (OR = 1.84), occupation as cader (OR = 1.71), all with statistical significance (P < 0.05). The artificial abortion rate of married patients was similar between the two groups, but the abortion frequency was fewer in endometriosis patients (P < 0.05). Multifactor analysis confirmed that the risk factors associated with endometriosis were menorrhagia and occupation as cadre only.