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发表于 2010-2-24 21:40:02
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本帖最后由 tc1220 于 2010-2-25 22:15 编辑
In this medical newsletter, it is reported that the hypothesis that secondary infections may prevent some patients from healing after severe muscle strain has been verified by preliminary study. This study is made by comparison between two groups, one is fed by antibiotics throughout the treatment. However, the other group is regarded as a controlled group and treated by the placebo which is actually sugar pill. By comparing the recuperation time, a conclusion is made that antibiotics could be used in the treatment of muscle strain. In several respects, however, flaws are found for supporting this argument.
To begin with, the study is based on a comparison experiment that aims to distinguish the effect influenced by different factor. For such controlled experiment, all other aspects should be kept constant while only one variable. Unfortunately, these two experiments are done by two different Doctors with different professions. Even if the specifications and other instructions are satisfied, the environment is different, which could be considered as the fault of the controlled experiment. In addition, the study doesn't specify the people’s condition in the group. Probably inequality occurs the people in two groups in terms of ages, health and sex. For example, one group consists of children, whereas the other group is made up of elders. Or perhaps one group suffers bad health while people in the second group are robust. If it is true, the result does not make sense. At last, the sample number is not stated clearly. Perhaps groups are sampled without sufficient data, which implies the invalidity of the experiments.
Furthermore, the assertion that antibiotics are effective for treating muscle strain only relies on the recuperation time. As we all known that goodness should be determined from all aspects with balance. However, in this study, the recuperation time becomes the only indicator that judges the effectiveness of the antibiotics. Obviously, it commits a fallacy of hasty generalization. For instance, patients may get some aside effects like headache during recuperation. Before clearly indicated, author cannot make such conclusion confidently. What’s more, the likelihood may even happen that the antibiotics may become the secondary infections that contribute to the healing of the muscle strain, which completely contradicts the hypothesis to be proved.
Last but not the least, the study appears no causal relationship between the hypothesis and the verification. Specifically, in the controlled experiment, no other additives are added to the patient so that they could be treated as secondary infections. In fact, what the experiment only focus on the research about the effectiveness of the antibiotics. Even if all the experiments are conducted correctly, the study only could be used to indicate the effect of antibiotics instead of the so called “secondary infections”. Therefore, hypothesis cannot be proved simply by this study.
In summary, the argument is unpersuasive as it stands. Basically, the experiment should be done under the same condition. And the evidence should be provided that no other aside effects after antibiotics are treated. Finally, secondary infection should be made in one group in order to verify the suspicion. |
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