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[[File:George W Bush with trick-or-treaters, Robins Air Force Base, Georgia - 20061031.jpg|300px|thumb|left]] The '''number needed to treat''' (or '''NNT''') is the average number of kids who need to go out on Halloween and ask for [[Gummy Bear Breast Implants|candy ]] in order to prevent one [[Syphilis|additional bad outcome]].