og12上一道题目，谢谢大侠

小娟子nana

Frazier and Mosteller assert that medical research could be improved by a move toward larger, simpler clinical trials of medical treatments. Currently, researchers collect far more background information on patients than is strictly required for their trials—substantially more than hospitals collect—thereby escalating costs of data collection, storage, and analysis. Although limiting information collection could increase the risk that researchers will overlook facts relevant to a study, Frazier and Mosteller contend that such risk, never entirely eliminable from research, would still be small in most studies. Only in research on entirely new treatments are new and unexpected variables likely to arise.

Frazier and Mosteller propose not only that researchers limit data collection on individual patients but also that researchers enroll more patients in clinical trials, thereby obtaining a more representative sample of the total population with the disease under study. Often researchers restrict study participation to patients who have no ailments besides those being studied. A treatment judged successful under these ideal conditions can then be evaluated under normal conditions. Broadening the range of trial participants, Frazier and Mosteller suggest, would enable researchers to evaluate a treatment’s efficacy for diverse patients under various conditions and to evaluate its effectiveness for different patient subgroups. For example, the value of a treatment for a progressive disease may vary according to a patient’s stage of disease. Patients’ ages may also affect a treatment’s efficacy.

不明白的是104题，由于时间比较紧，我就直接截图了···我的问题是，原文一直在讲Frazier and mosteller理论的优势，但是题目问的是which of the following advantages over````Frazier and mosteller这下子我就蒙了···答案选c。大家能帮帮我解决这题吗？谢谢

小娟子nana

怎么没人··呜呜

hughlv

没行号，应该指的是这句吧Often researchers restrict study participation to patients who have no ailments besides those being studied.

也就是选取的样本病人只患有作为研究对象的疾病。

似乎需要自己做一些推导了，文章中没有显式指出。因为样本病人只患了这种病，因此研究者观察到的就是这种病导致的结果。假如如F和M所建议的，那么这个病人的现象可能是多种病导致的，研究者在分析结果时将需要考虑额外的因素，因此大大增加工作量。