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本帖最后由 Bela1229 于 2010-3-18 20:28 编辑
argument51.Thefollowing appeared in a medical newsletter.
"Doctors have long suspected that secondary infections may keep some
patients from healing quickly after severe muscle strain. This hypothesis
has now been proved by preliminary results of a study of two groups of
patients. The first group of patients, all being treated for muscle
injuries by Dr. Newland, a doctor who specializes in sports medicine, took
antibiotics regularly throughout their treatment. Their recuperation time
was, on average, 40 percent quicker than typically expected. Patients in
the second group, all being treated by Dr. Alton, a general physician,
were given sugar pills, although the patients believed they were taking
antibiotics. Their average recuperation time was not significantly
reduced. Therefore, all patients who are diagnosed with muscle strain
would be well advised to take antibiotics as part of their treatment."
Merely based on a study whose result might act as a support for the recommendation, the speaker hastily comes to the conclusion that all patients should take antibiotics as part of their treatment when diagnosed with muscle strain. At first glance this recommendation seems to be logical on the grounds that the study reveals one of the groups who took the antibiotics had shorter recuperation time compared with those of the other group. However, a careful analysis of the recommendation reveals several problems with it.
First, the author provides no specific information of the study itself. We have no idea whether the sample of the study is statistically significant and whether the patients involved in this study can represent all the patients treated for muscle injuries. Lacking such information, there are chances that the physical conditions of the patients in these two groups were different and perhaps patients of the former group were much healthier and even younger than those of the latter. Moreover, it is equally possible that the size of the sample in this study wasn't large enough to draw any reasonable conclusion. Either scenario, if true, would serve toundermine the speaker's recommendation that patients should take antibiotics.
Secondly, granted that the study was statistically reliable and the sample was representative, the author overlooks other possible factors apart from the influence of antibiotics may take effecton the patients' recovery. Though the recuperation time in the first group was quicker than that of the second one, this fact doesn't suffice in itself to substantiate that it was the antibiotics that determined their recuperationtime. Perhaps the difference in the doctors' medical skill was the key determinant of the recuperation time. Common experience and sense tell me that the doctor who specializes in sports medicine is better able to cure patients than the doctor who is a general physician. It is equally possible that the severity of the muscle strain is different and patients in the first group suffered more serious illness. Without ruling out these likelihoods, the speaker cannot convince me on this study.
Last but not least, even assuming the study can confirm that the patients' quicker recuperation was attributed to the use of antibiotics; it is unfair to extend the recommendation to embrace all the patients diagnosed with muscle strain. The degree of adaptation of antibiotics,as well as the physical condition, varies from person to person. The hasty conclusion that all the patients would be well advised to take antibioticsflies in the face of persons who cannot adapt themselves to antibiotics as such medicine might harm their bodies. Without taking these people into consideration, the speaker's recommendation is unjustifiable.
In sum, the evidence cited in the recommendation lends little support to what the arguer maintains. In order to make a sounder recommendation, the speaker should ensure that the study can suffice to reflect that it was the antibiotics used in the study that determined the quicker recuperation time in the first group. In order to extend his assertion to embrace all the patients suffering muscle strain, the speaker needs to get more knowledge of whether there are certain persons that cannot adapt themselves to antibiotics. |
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