Breast cancer is one of the most common malignancies among women in Canada and the U.S....
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Breast cancer is one of the most common malignancies among women in Canada and the U.S. If it is detected early enough-before the cancer spreads chances of successful treatment are much better. Do screening pro- grams speed up detection by enough to matter? Many studies have examined this question. The Canadian National Breast Cancer Study was a randomized controlled experiment on mammography, that is, x-ray screening for breast cancer. The study found no benefit from screening. (The benefit was measured by com- paring death rates from breast cancer in the treatment and control groups.) Dr. Daniel Kopans argued that the randomization was not done properly: in- stead of following instructions, nurses assigned high risk women to the treat- ment group. Would this bias the study? If so, would the bias make the benefit from screening look bigger or smaller than it really is? Explain your answer. Ular werkt. Breast cancer is one of the most common malignancies among women in Canada and the U.S. If it is detected early enough-before the cancer spreads chances of successful treatment are much better. Do screening pro- grams speed up detection by enough to matter? Many studies have examined this question. The Canadian National Breast Cancer Study was a randomized controlled experiment on mammography, that is, x-ray screening for breast cancer. The study found no benefit from screening. (The benefit was measured by com- paring death rates from breast cancer in the treatment and control groups.) Dr. Daniel Kopans argued that the randomization was not done properly: in- stead of following instructions, nurses assigned high risk women to the treat- ment group. Would this bias the study? If so, would the bias make the benefit from screening look bigger or smaller than it really is? Explain your answer. Ular werkt.
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