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The average length of time that a patient lived after being diagnosed with stomach cancer in a certain state increased steadily beginning in 1982. The reason for this increase is that more people experienced a complete remission of their disease than previously. Improved surgical techniques that increased the effectiveness of removing cancerous growths at an advanced stage of development were responsible for the increase in longevity of people diagnosed with stomach cancer.
Which of the following, if true, would most likely be used as evidence to show that improved surgical techniques used on cancer patients diagnosed with stomach cancer were responsible for increasing the longevity of stomach cancer patients?
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AAfter 1982, patients whose cancer was diagnosed at an earlier state underwent more surgery than did those who were diagnosed at a more advanced stage.
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BThe percentage of people diagnosed with stomach cancer whose cancerous growths were at an advanced stage of development was the same before 1982 as after 1982.
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CA greater percentage of the population was diagnosed with stomach cancer from 1982 to 1992 than was prior to 1982.
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DStomach surgery was performed on the same percentage of the general population before 1982 as after 1982.
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EOther improvements in health care, including earlier detection and nonsurgical treatments, were instituted at major hospitals throughout the state beginning in 1982.
B显示答案
