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Effectiveness of school-home intervention for adolescent obesity prevention: parallel school-randomized study

  • Michele Ribeiro Sgambato (a1), Diana Barbosa Cunha (a1), Bárbara da Silva Nalin Souza (a2), Viviana Teixeira Henriques (a1), Renata da Rocha Muniz Rodrigues (a1), Ana Lúcia Viégas Rêgo (a3), Rosangela Alves Pereira (a3), Edna Massae Yokoo (a2) and Rosely Sichieri (a1)...

Abstract

Many school-based interventions for obesity prevention have been proposed with positive changes in behavior, but unsatisfactory results on weight change. The objective was to verify the effectiveness of a combined school and home-based obesity prevention program on excessive weight gain in adolescents. Teachers delivered the school-based primary prevention program to fifth and sixth graders (9 schools, 48 control classes, 49 intervention classes), which included encouraging healthy eating habits and physical activity. A subgroup of overweight or obese adolescents also received a home-based secondary prevention program delivered by community health professionals. Schools were randomized to intervention or control group. Intent-to-treat analysis used mixed models for repeated continuous measures and considered the cluster effect. The main outcomes were changes in body mass index (BMI) and percent body fat (%body fat) after one school-year of intervention and follow-up. Against our hypothesis, BMI increased more in the intervention group than in the control group (Δ=0.3kg/m2; p=0.05) with a greater decrease in %body fat among boys (Δ=-0.6%; p=0.03) in the control group. The intervention group increased physical activity by 12.5 minutes per week compared with the control group. Female adolescents in the intervention group ate healthier items more frequently than in the control group. The subgroup who received both the school and home interventions had an increase in %body fat than in the control group (Δ=0.89%; p=0.01). In this study, a behavioral change led to a small increased in physical activity and healthy eating habits but also to an overall increase in food intake.

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Corresponding author

*Corresponding author: Michele Ribeiro Sgambato, Email: michelesgambato@hotmail.com, Telephone number: 55 21 97185-5217

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