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病例组选自纽约州西部伊利和尼亚加拉两县所有大医院1986-1991年间经组织学检查确诊的年龄在40-85岁之间的740名乳腺癌妇女(其中绝经前妇女301名,绝经后妇女439名);以随机抽取的年龄频数相匹配的两县810名无乳腺
The case group was selected from 740 breast cancer women aged 40-85 years old (301 premenopausal women, postmenopausal women) who were diagnosed by histological examination from 1986 to 1991 in all the major hospitals in Erie and Niagara County, New York State. 439); 810 amammary glands in two counties matched by randomized age frequency