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8.2作业 argument 51
51.The following 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."
1、论据不足以支持假设的结论. 实验组和对照组的设计不平衡,应该其他都保持一致,一组用药,一组不用药.医生水平,病人严重程度,数量,以及提供的其他治疗都应该保持一致.最后看用药组的恢复时间是否显著的快于不用药组.
2、即使说该假设可以被证明,那也不能得出所有肌肉拉伤的患者都需要服用抗生素的结论。假设只是说二次感染可能造成恢复缓慢,并没有说一定;只说有些病人,并没有所有病人;只说严重的肌肉拉伤,没有针对普通的肌肉拉伤。
字数:520 时间:45分 2006-8-2
Before subscribing the antibiotics to all the patients diagnosed with muscle strain, the evidence from the study should be examined more carefully. The study is not well devised so that fails to reveal the real effect of the antibiotics convincingly. Moreover, the hasty generalization from the hypothesis to the conclusion that all the patients diagnosed with muscle strain should be treated with antibiotics may result in an abuse of this medicine.
First of all, to separate the partial effect of the antibiotics, the study should be controlled, with a balance between the experimental and the control groups. The two groups should be controlled with the doctors at the same level, patients with similar severities of hurt, ages and physical statuses and with the same treatments just except for whether or not taking antibiotics. Otherwise, the different results may simply reflect the different effects of the levels of the doctors and their treatments or differences in severities of the muscle strain and abilities to recover. In the study, the second group is treated by a general physician who may have little experience in dealing with muscle stain while the first group is treated by a doctor who specializes in this field. The different time of recuperation may just reflect the experience of the doctors and the effects of different treatments given by them. It is also possible that the characteristics of the patients are not well controlled. The average severity of the first group may be much lighter than that of the second one; so the patients of the first group are less likely to suffer from the secondary infections which may prevent them from healing quickly. Or the patients of the first group are much better in physical status on average and thus are more likely to heal quickly from the muscle strain. Therefore, the study fails to balance the first and second groups and control all the other possible factors so that it leaves the effect of the antibiotics unpersuasive.
Furthermore, even if the study has been devised well and proved the hypothesis statistically, it is too hasty to generalize the use of antibiotics to all the patients diagnosed with muscle strain. First, the hypothesis just mentions that secondary infections may affect some patients, not all the patients. It may be no use to subscribe the antibiotics to the patients who are not infected. Moreover, some patients may be allergic to the antibiotics and should not be treated in this way. Second, the hypothesis just focuses on the severe muscle strain, not all kinds of muscle strain. The patients with ordinary muscle strain may be unlikely to suffer from the secondary infections and thus don't need antibiotics. The hasty generalization would result in an abuse of antibiotics and may hurt the health of the patients rather than help them recover from the muscle strain quickly.
In sum, to substantiate the hypothesis, the study should be well devised with a balance between two groups controlling all other relevant factors. And much more other examinations should be done before the hypothesis is generalized to all the patients diagnosed with muscle strain. |
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