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Sample Attrition in Teen Pregnancy Prevention Impact Evaluations Fact Sheet

Publication/Fact Sheet
 Monitoring and Evaluation Research on TPP Programs and Components Teen Pregnancy Prevention Program
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OPA/Mathematica
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A randomized controlled trial (RCT) is able to produce an unbiased estimate of an intervention's effect. However, when a small or non-representative subset of the initially assigned sample is used, the resulting estimate of effectiveness may be biased. This brief outlines how non-response (i.e., sample attrition) affects individual- and cluster-level RCTs, how the bias from attrition can be assessed, and strategies to limit sample attrition in teen pregnancy prevention evaluations.

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