Résumé :
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[BDSP. Notice produite par INIST R0xgsF1A. Diffusion soumise à autorisation]. Context Some observational studies have found an association between television viewing and child and adolescent adiposity. Objective To assess the effects of reducing television, videotape, and video game use on changes in adiposity, physical activity, and dietary intake. Design Randomized controlled school-based trial conducted from September 1996 to April 1997. Setting Two sociodemographically and scholastically matched public elementary schools in San Jose, Calif. Participants Of 198 third-and fourth-grade students, who were given parental consent to participate, 192 students (mean age, 8.9 years) completed the study. Intervention Children in 1 elementary school received an 18-lesson, 6-month classroom curriculum to reduce television, videotape, and video game use. Main Outcome Measures Changes in measures of height, weight, triceps skinfold thickness, waist and hip circumferences, and cardiorespiratory fitness ; self-reported media use, physical activity, and dietary behaviors ; and parental report of child and family behaviors. The primary outcome measure was body mass index, calculated as weight in kilograms divided by the square of height in meters. Results Compared with controls, children in the intervention group had statistically significant relative decreases in body mass index (intervention vs control change : 18.38 to 18.67 kg/m2 vs 18.10 to 18.81 kg/m2, respectively ; adjusted difference - 0.45 kg/m2 [95% confidence interval (CI), - 0.73 to - 0. (...)
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