紫书53题

There is a great deal of geofraphical variation in the frequency of many surgical procedures--up to tenfold variation per hundred thousand people among different areas in the numbers of hysterectomies,prostatectomies,and tonsillectomies.

To support a conclusion that much of the variation is due to unnecessary surgical procedures,it would be most important to establish which of the following?

a.A local board of review at each hospital examines the records of every operation to determine whether the surgical procedure was necessary.

b.The variation is unrelated to factors(other than the surgical procedures themselves)that influece the incidence of diseases for which surgery might be considered.

c.There are several cateforeis of surgical procedure(other than hysterectomies,prostatectomies,and tonsillectomies)that are often perfomed unnecessarily

d.For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.

e.With respect to how often they are performed unnecessarily,hysteretomies,prostatectomies,and tonsillectomies are representative of surgical procedures in general.

 答案选B．但是偶看不大懂

There is a great deal of geofraphical variation in the frequency of many surgical procedures--up to tenfold variation per hundred thousand people among different areas in the numbers of hysterectomies,prostatectomies,and tonsillectomies.

在不同地区进行手术的次数变化很大-不同地区hysterectomies,prostatectomies,and tonsillectomies手术次数每十万人会差十倍

To support a conclusion that much of the variation is due to unnecessary surgical procedures,it would be most important to establish which of the following?

为证明这种差别是因为不必要的手术引起的结论,下面哪一个前提会最有力支持这个结论?

b.The variation is unrelated to factors(other than the surgical procedures themselves)that influece the incidence of diseases for which surgery might be considered

这种差别同引起可能要进行手术的疾病的因素无关(不包括手术本身)

不是NN，刚做过，说一下我的看法。

To support a conclusion that much of the variation is due to unnecessary surgical procedures,it would be most important to establish which of the following?

作者的观点是：手术的地区差异是由不必要的手术引起的（而不是由于疾病本身的差异引起的）。问哪个选项支持作者。

B的解释是：手术的地区差异与影响疾病的医生必须考虑的因素无关。取非，如果差异与疾病本身因素有关，那么可能是一种地区性的疾病特征，当地的医生必须采用不同的手术方法，导致d的结果－－手术的地区差异就不是非必要（ＵＮＮＥＣＥＳＳＡＹ）的了。　与问题矛盾．