In an analysis of six large experiments in which, as usual, depressed patients received either a placebo or an active drug, the true drug effect—that is, in addition to the placebo effect—was "nonexistent to negligible" in patients with mild, moderate, and even severe depression. Only in patients with very severe symptoms (scoring 23 or above on the standard scale) was there a statistically significant drug benefit. Such patients account for about 13 percent of people with depression.
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