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Effects of total extracurricular activity participation (TEAP) during the last 2 years of high school were examined using the large, nationally representative High School and Beyond data. After controlling background variables and sophomore outcomes, TEAP had small but statistically significant and positive relations with 17 of 22 senior and postsecondary outcomes (e.g., social and academic self-concept, educational aspirations, coursework selection, homework, absenteeism, academic achievement, and subsequent college attendance). Whereas there were small nonlinear components, increases in TEAP across almost the whole range of TEAP scores were associated with increases in benefits for most of the outcomes
Herbert W. Marsh (Tue,) studied this question.