The extent to which a prevention program achieves desired outcomes when used in an applied setting rather than in the original research conditions is known as

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Effectiveness refers to the success of a prevention program when used in real-life settings, which may differ from the controlled conditions of a research study that establish efficacy. The number needed to treat refers to the number of people who need to receive treatment for one person to benefit. The reduction of risk refers to a decrease in the likelihood of a negative outcome. Efficacy refers to the success of a prevention program in controlled research conditions.

The Extent to Which a Prevention Program Achieves Desired Outcomes