The British Medical Journal's "Clinical Evidence" analyzed common medical treatments to evaluate which are supported by sufficient reliable evidence (BMJ, 2007). They reviewed approximately 2,500 treatments and found:
• 13 percent were found to be beneficial
• 23 percent were likely to be beneficial
• Eight percent were as likely to be harmful as beneficial
• Six percent were unlikely to be beneficial
• Four percent were likely to be harmful or ineffective.
• 46 percent were unknown whether they were efficacious or harmful
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