Efficacy of a Theory-Based Abstinence-Only Intervention Over 24 Months A Randomized Controlled Trial With Young Adolescents John B. Jemmott III, PhD; Loretta S. Jemmott, PhD, RN; Geoffrey T. Fong, PhD Arch Pediatr Adolesc Med. 2010;164(2):152-159. Objective: To evaluate the efficacy of an abstinence-only intervention in preventing sexual involvement in young adolescents. Design: Randomized controlled trial. […]