title: The "number needed to treat" turns 20--and continues to be used and misused.
authors.affiliation: Dr. McAlister is from The Division of General Internal Medicine, University of Alberta, Edmonton, AB. Finlay.McAlister@ualberta.ca
authors.forename: Finlay A
authors.initials: FA
authors.lastname: McAlister
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D016001:Confidence Intervals; D003627:Data Interpretation, Statistical; D006801:Humans; D018570:Risk Assessment; D018401:Sample Size
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