15. Appendicitis gwd上的一道题 我粘过来了Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost always have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since ___B___.A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitisB. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have itC. all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitisD. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitisE. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis 这个怎么解释的呢？？？？ -- by 会员 wangwen21 (2012/2/4 17:24:09)
最后一句话的意思是：在 很大程度上不会把一个没有得A的人判断为得A从而导致不必要的 remove appendix的同时也不会漏掉任何一个得A的人。要符合这个条件，只有那百分之二被误诊的人是属于前者的，因为前者是largely avoid的，而后者是可以完全避免的。 不知道我解释的对不对呀，个人理解。 -- by 会员 suntree846 (2012/2/4 20:56:09)
还是不太懂啊，however, performing any fewer necessary ones than before,这句话是什么意思呢？
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发表于 2012-2-6 11:05:39
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