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Follow-up Difficulty and Retention: Evaluating Potential Attrition Bias in a Longitudinal Substance Abuse Treatment Study
BACKGROUND: Participant attrition threatens validity in longitudinal research. Non-random attrition creates "attrition bias," that could compromise result generalizability. This study explores the impact of attrition on a longitudinal substance use study. METHODS: Easy-to-contact (ETC) participants, difficult-to-contact (DTC) ...