27. Summary of Strength of Evidence for Recommendations

Treating Tobacco Use and Dependence: 2008 Update

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Strength of evidence classification Criteria
Strength of Evidence = A Multiple well-designed randomized clinical trials, directly relevant to the recommendation, yielded a consistent pattern of findings.
Strength of Evidence = B Some evidence from randomized clinical trials supported the recommendation, but the scientific support was not optimal. For instance, few randomized trials existed, the trials that did exist were somewhat inconsistent, or the trials were not directly relevant to the recommendation.
Strength of Evidence = C Reserved for important clinical situations where the panel achieved consensus on the recommendation in the absence of relevant randomized controlled trials.


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Page last reviewed October 2014
Page originally created September 2012
Internet Citation: 27. Summary of Strength of Evidence for Recommendations. Content last reviewed October 2014. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/clinicians-providers/guidelines-recommendations/tobacco/clinicians/presentations/2008update-full/slide27.html