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どなたか，ＯＧのＣＲ問題についてご解説いただけませんでしょうか？
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There is a great deal of geographical 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 a conclusion that much of the variation is due to unnecessary surigical procedures, it would be most important to establish which of the following?

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

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