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

To support the 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 procedures was necessary.

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

C. There are several categories of surgical procedure (other than hysterectomies, prostatectomies, tonsillectomies) that are 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 succeded.

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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