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 thenselves ) 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 perfirmed unnecessarily.
(D)For certain surgical procedures, it is difficult to determine after the operation rhwther the procedures were necessary or whether alternative treatment would have succeeded.
(E)With respect to how often they are performed ennecessarily, hysterectomies prostatectomies, and tonsillectomies are representative of surgical procedures in general.
Ans:B
我這題看不太懂耶...