In a National Cancer Institute study of the potential benefits of breast self-exams, 226,064 Chinese women in Shanghai were randomly assigned to a breast self-exam instruction group (132,979 women) or a control group (133,085 women). Over the next 10 to 11 years, there were 131 breast cancer deaths in the self-exam group, and 135 breast cancer deaths in the control group. The authors concluded that "intensive instruction in breast self-exam did not reduce mortality from breast cancer." What were the rates of breast cancer deaths in the two groups per 100,000 women?

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The Answer of In a National Cancer Institute study of the potential benefits of breast self-exams, 226,064 Chinese women in Shanghai were randomly assigned to a breast self-exam instruction group (132,979 women) or a control group (133,085 women). Over the next 10 to 11 years, there were 131 breast cancer deaths in the self-exam group, and 135 breast cancer deaths in the control group. The authors concluded that "intensive instruction in breast self-exam did not reduce mortality from breast cancer." What were the rates of breast cancer deaths in the two groups per 100,000 women?

In a National Cancer Institute Study of the Potential Benefits