Developed by a trio of epidemiologists back in the '80s, the "number needed to treat," or NNT, describes how many people would need to take a drug for one person to benefit. The NNT is not a statistic that's routinely conveyed to either doctors or patients. But you can look it up on a site that you've probably never heard of: TheNNT.com, started by Dr. David Newman, a director of clinical research at Icahn School of Medicine at Mount Sinai Hospital.
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