ChaseDream
搜索
返回列表 发新帖
00:00:00

There is a great deal of geographical 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?

正确答案: B

更多相关帖子

524

帖子

15

好友

4712

积分

ChaseDream

注册时间
2003-03-17
精华
8
解析
查看: 1785|回复: 2
打印 上一主题 下一主题

[讨论]og紫皮53题

[复制链接]
楼主
发表于 2008-4-14 23:17:00 | 只看该作者

[讨论]og紫皮53题

53.There is a great deal of geographical 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
influence the incidence of diseases for which surgery might be considered.

(C) There are several categories of surgical procedure(other than hysterectomies,
prostatectomies,and tonsillectomies)that are often performed 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, hysterectomies,
prostatectomies,and tonsillectomies are representative of surgical procedures in general.

Reasoning: What additional information must be true for this conclusion to hold? Is it possible that different factors in different regions might reasonably account for the variation? Diseases or medical conditions for which these surgical procedures are appropriate might be more common in one geographical area than another.If the possibility of such geographical variations in the incidence of pertinent me(1ical conditions is ruled out,it is fair to conclude that the variation Can be attributed to unnecessary surgical procedures.

B Correct.This statement properly identifies additional information that eliminates the possibility that the geographical variation is due to legitimate factors.

og的解释丝毫看不懂,有没有好心的xdjm帮忙解释一下,谢谢

沙发
发表于 2008-4-15 15:47:00 | 只看该作者
可以这么理解:原文是要证明unecessary surgical procedures导致了variation,而variation还有可能会由其他原因导致,比如地理原因等等。如果排除了其他原因会导致variation,就能证明是unecessary surgical procedures导致了variation。而B选项讲的正是这个。
板凳
 楼主| 发表于 2008-4-15 22:36:00 | 只看该作者

多谢,你的思路很清晰

您需要登录后才可以回帖 登录 | 立即注册

Mark一下! 看一下! 顶楼主! 感谢分享! 快速回复:

手机版|ChaseDream|GMT+8, 2024-11-9 05:51
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号

ChaseDream 论坛

© 2003-2023 ChaseDream.com. All Rights Reserved.

返回顶部