The objective of this study was to analyze the influence of parents and Physical Education teachers on adolescent's extracurricular Physical Activity. Data were obtained from the Chilean System for the Assessment of Educational Quality test with a large representative sample of 23,180 students (11,927 females and 11,253 males aged 13.7 and 13.8 years respectively). The analyzed variables were the extracurricular physical activity of adolescents, parents’ and physical education teachers’ encouragement to do physical activity and parents’ physical activity behavior. Associations between variables were analyzed using chi-squared tests. Two logistic regression models, one adjusted and the other unadjusted, were performed for each physical activity variable (vigorous, moderate, mild and total) in order to obtain odds ratios from parents’ and physical education teachers’ influence variables. Results showed that parents’ influence is more relevant than physical education teachers’ influence in order to promote physical activity in adolescents, regardless of age, sex and physical condition.
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