GMAT Critical Reasoning

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Source: OG

Level: 3

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 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.

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