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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 between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies.
To support a conclusion that much of the variation is due to unnecessary surgical procedure, it would be most important to establish which of the following?
| Text from Passage | Analysis |
| There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies. |
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This passage doesn't present a complete argument - it only gives us one key fact about surgical variation. The question stem then asks what we'd need to establish to support a specific conclusion about unnecessary procedures.
There is no explicit conclusion in this passage. The question stem references a potential conclusion that 'much of the variation is due to unnecessary surgical procedures' but this conclusion isn't stated in the argument itself.
We have an evidence-seeking structure. The passage provides evidence (geographical variation in surgery rates), and the question asks what additional evidence we'd need to support the conclusion that this variation indicates unnecessary procedures. The logical gap is between observing variation and concluding that variation equals unnecessary surgery.
Strengthen - We need to find information that would make us more confident that the geographical variation in surgery rates is due to unnecessary procedures
The passage presents frequency data (up to tenfold variation) comparing surgical procedure rates across different geographical areas for specific surgeries
To strengthen the conclusion that variation is due to unnecessary surgeries, we need to eliminate alternative explanations and show evidence pointing toward medical inappropriateness. We should look for scenarios that rule out legitimate medical reasons for the variation and suggest that some areas are performing surgeries when they shouldn't be
This describes a review process but doesn't help establish that variation is due to unnecessary procedures. Even if every hospital has a review board, this doesn't explain why we observe geographical variation in surgery rates. The existence of oversight doesn't strengthen the conclusion that variation indicates unnecessary surgeries - it's just describing a quality control mechanism.
This is exactly what we need to strengthen the conclusion. If the variation isn't related to factors that legitimately influence disease rates (like environmental conditions, demographics, genetics, lifestyle), then we've eliminated the main alternative explanation for why surgery rates differ. When legitimate medical factors can't explain the variation, it strongly suggests that some areas are performing unnecessary procedures while others aren't.
This talks about other types of surgeries being unnecessary, but doesn't help explain the geographical variation we observed in our specific procedures. Knowing that other surgeries are sometimes unnecessary doesn't strengthen the link between variation and unnecessary procedures for hysterectomies, prostatectomies, and tonsillectomies.
This actually weakens our ability to conclude anything about unnecessary procedures. If it's difficult to determine whether procedures were necessary after the fact, then we can't confidently conclude that variation indicates unnecessary surgeries. This creates doubt rather than support.
This addresses whether our three example procedures are representative of surgery in general, but doesn't help establish that the variation we observed is due to unnecessary procedures. Even if these surgeries are representative, we still need to explain why the geographical variation occurs.