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(-7 pp.). Participation in school sporting activities reduces the likelihood of being overweight only for students of middle and low SES (-5,5 pp.). For adolescents of high SES, the distance between their school and the nearest fast food restaurant decreases the likelihood of being overweight (-4.7 pp. per km.). Conclusions:The determinants of overweight differ by SES. Public policy design should consider socioeconomic inequalities that characterize the Chilean reality. (Rev Med Chile 2015; 143: 598-605)

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