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Cancer Prevention02:59

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Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
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Preventive Healthcare Services01:30

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A Novel Method for Involving Women of Color at High Risk for Preterm Birth in Research Priority Setting
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Update on the Methods of the U.S. Preventive Services Task Force: Methods for Understanding Certainty and Net Benefit

Alex H Krist1, Tracy A Wolff2, Daniel E Jonas3

  • 1Department of Family Medicine and Population Health, Virginia Commonwealth University, Richmond, Virginia.

American Journal of Preventive Medicine
|December 20, 2017
PubMed
Summary

The U.S. Preventive Services Task Force (USPSTF) uses rigorous methods to create evidence-based recommendations for preventive services. When direct evidence is limited, they employ specific techniques to ensure recommendations reflect the best available data on benefits and harms.

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Area of Science:

  • Preventive medicine
  • Evidence-based practice
  • Health policy

Background:

  • The U.S. Preventive Services Task Force (USPSTF) has a long history of developing evidence-based recommendations.
  • Recommendations focus on the net benefit (benefits minus harms) of preventive services.
  • High-quality studies directly assessing both benefits and harms are often scarce.

Purpose of the Study:

  • To detail the methodologies used by the USPSTF to make evidence-based recommendations.
  • To explain how the USPSTF addresses evidence gaps in preventive services.
  • To illustrate the application of USPSTF methods with examples.

Main Methods:

  • Utilizing applicability to generalize evidence to primary care populations.
  • Employing coherence to link disparate evidence bodies.
  • Using extrapolation to infer outcomes for unstudied populations and service intervals.
  • Applying conceptual bounding to estimate plausible benefit and harm limits.

Main Results:

  • The USPSTF employs a structured approach to overcome limitations in direct evidence for preventive services.
  • Methodologies like applicability, coherence, extrapolation, and conceptual bounding are crucial for evidence synthesis.
  • Evidence is extended only to the point where moderate certainty of findings is maintained.

Conclusions:

  • The USPSTF's methods ensure that recommendations for preventive services are grounded in the best available evidence, even when direct studies are limited.
  • These rigorous approaches allow for the creation of reliable guidance for promoting population health.
  • The USPSTF's commitment to evidence-based decision-making is exemplified by these detailed methodologies.