David L. Hahn, MD, MS
Potential Financial Conflicts of Interest: None disclosed.
Hahn D.; Indirect Versus Direct Evidence in U.S. Preventive Services Task Force Recommendations. Ann Intern Med. 2008;148:708. doi: 10.7326/0003-4819-148-9-200805060-00013
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Published: Ann Intern Med. 2008;148(9):708.
TO THE EDITOR:
Clinicians and policymakers rely on the U.S. Preventive Services Task Force (USPSTF) for reliable and accurate information. In their recent update on USPSTF methods, Sawaya and colleagues (1) described USPSTF criteria for constructing and evaluating an indirect “chain of evidence” for the effectiveness of a preventive service when direct evidence from 1 or more randomized effectiveness studies is unavailable. They also stated that their methods for making evidence-based recommendations would continue to evolve. I have a comment about the chain-of-evidence approach and suggest the next step in the evolution of the recommendation process.
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