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SlideshowReport

Drugs and Publication Bias

Description
To get FDA approval for a new medication, a pharmaceutical company must present evidence of the drug’s effectiveness. On the bars in this figure, each box represents one study. On the left side, you can see that most of the published studies supported the effectiveness of 12 antidepressants. But when independent researchers got hold of all of the data submitted to the FDA, they found that many unpublished studies had questionable or negative results (right). (Based on Turner et al., 2008.)
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