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<p>The proportion of recommendations supported by data from randomized controlled trials actually decreased from 2008. In looking at updated guidelines, the researchers found that fewer recommendations were supported by randomized controlled trials than in the prior versions.</p>

Few Cardiology Treatment Recommendations Based on High-Quality Evidence

Findings suggest incremental changes are not enough

The proportion of recommendations supported by data from randomized controlled trials actually decreased from 2008. In looking at updated guidelines, the researchers found that fewer recommendations were supported by randomized controlled trials than in the prior versions.