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应用病例对照研究分析方法探讨兰州市女性乳腺癌的发生与有关生育因素之间的关系。结果：初潮年龄早，初潮初产间隔大，生育次数少，结婚年龄晚，其相对危险性（ＯＲ）较大（Ｐ＜０．０５）；绝经年龄早、痛经，其危险度较大（Ｐ＜０．０５）。提示对高危险因素人群应及早筛检，早期防治
Case-control study analysis method was used to investigate the relationship between the occurrence of breast cancer and related fertility factors in females in Lanzhou City. Results: The age of menarche is early, the interval of early menarche is large, the number of births is small, and the age of marriage is late. The relative risk (OR) is relatively large (P<0.05). The age of menopause and dysmenorrhea are relatively high (P<0.05). <0.05). Tips should be early screening for high risk factors, early prevention