Effect of a multicomponent intervention on variables related to screen time in adolescents: a cluster-randomized controlled trial

Palavras-chave: Clinical trial, Sedentary lifestyle, School health, Brazil

Resumo

O objetivo desse estudo foi avaliar o efeito de uma intervenção sobre tempo de tela e em fatores psicossociais (atitude, autoeficácia, suporte da família e dos membros da escola) associados à redução do tempo de tela em escolares. Ensaio randomizado controlado por conglomerado realizado em três escolas no grupo intervenção (n = 548) e três no grupo controle (n = 537). A intervenção focou na capacitação de professores, oportunidades para prática de atividade física na escola e redução do tempo de tela, bem como educação em saúde. O questionário (aplicado em julho e dezembro de 2014) incluiu questões sobre tempo usando TV e computador/ videogame em dias de semana e m de semana (combinados em tempo de tela total). Os fatores psicossociais foram obtidos por meio de escalas. As variáveis de controle foram escola e classe econômica. A análise incluiu modelos de regressão logística binária e modelos lineares generalizados. O tamanho do efeito foi calculado, com análises estratificadas por sexo e faixa etária (p < 0,05). Após o acompanhamento, escolares da intervenção tiveram maiores chances de reduzir o tempo de TV (rapazes: OR = 2,86; IC95%: 1,06-7,71) e computador/videogame (moças: OR = 3,34; IC95%: 1,14-9,84; 11 a 13 anos: OR = 3,08; IC95%: 1,17- 8,08) para < 2 horas/dia (p < 0,05). Efeitos positivos da intervenção ocorreram sobre atitude (entre moças e adolescentes de ambas as faixas etárias) e suporte escolar (todos subgrupos), com tamanhos de efeito variando de 0.21 a 0.54. Conclui-se que a intervenção ocasionou melhoras em determinados componentes do tempo de tela, assim como na atitude e no suporte escolar. Intervenções no contexto escolar podem colaborar para a redução do tempo de tela na população jovem.

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Publicado
14-08-2018
Seção
Artigos Originais