title: Effect of intervention programs in schools to reduce screen time: a meta-analysis.
abstract: OBJECTIVE
  to evaluate the effects of intervention program strategies on the time spent on activities such as watching television, playing videogames, and using the computer among schoolchildren.
  
  
  METHODS
  a search for randomized controlled trials available in the literature was performed in the following electronic databases: PubMed, Lilacs, Embase, Scopus, Web of Science, and Cochrane Library using the following Keywords randomized controlled trial, intervention studies, sedentary lifestyle, screen time, and school. A summary measure based on the standardized mean difference was used with a 95% confidence interval.
  
  
  RESULTS
  a total of 1,552 studies were identified, of which 16 were included in the meta-analysis. The interventions in the randomized controlled trials (n=8,785) showed a significant effect in reducing screen time, with a standardized mean difference (random effect) of: -0.25 (-0.37, -0.13), p<0.01.
  
  
  CONCLUSIONS
  interventions have demonstrated the positive effects of the decrease of screen time among schoolchildren.
authors.affiliation: Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil. Electronic address: robertafriedrich@hotmail.com.
authors.forename: Roberta Roggia
authors.initials: RR
authors.lastname: Friedrich
authors.affiliation: Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
authors.forename: Jéssica Pinto
authors.initials: JP
authors.lastname: Polet
authors.affiliation: Departament of Social Medicine, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
authors.forename: Ilaine
authors.initials: I
authors.lastname: Schuch
authors.affiliation: Departament of Social Medicine, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
authors.forename: Mário Bernardes
authors.initials: MB
authors.lastname: Wagner
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003201:Computers / Q000706:statistics & numerical data; D006293:Health Promotion / Q000706:statistics & numerical data*; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012574:Schools; D057185:Sedentary Behavior; D013690:Television / Q000706:statistics & numerical data; D013997:Time Factors; D018910:Video Games; D055815:Young Adult
keywords: Adolescent; Adolescente; Child; Criança; Estilo de vida sedentário; Saúde escolar; School health; Sedentary lifestyle