Number Needed to Treat (NNT): Conveying the Likelihood of a Therapeutic Effect

Guide to Statistics and Methods: Number Needed to Treat: Conveying the Likelihood of a Therapeutic Effect – JAMA (free for a limited period)

Related: Number needed to treat (NNT) in clinical literature: an appraisal – BMC Medicine (free) AND The Numbers Needed to Treat and Harm (NNT, NNH) Statistics: What They Tell Us and What They Do Not – The Journal of Clinical Psychiatry (free)

See also: The NNT Website (resource on the subject with tutorials and practical examples)