Distributions of select variables between breast cancer cases and cancer-free controls.
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aAge at menarche information was available in 1755 breast cancer cases and 1858 controls;bAge at first live birth information was available in 1680 breast cancer cases and 1815 controls; 65 subjects were nulliparous while 99 were with missing information;cAge at natural menopause information was available in 743 breast cancer cases and 809 controls.
创建时间：
2015-12-02
