title: [Prevalence of physical inactivity and associated factors in adolescents].
abstract: OBJECTIVE
  To estimate the prevalence of physical inactivity among adolescents (14-18 years) in the city of Maringá/PR and to explore its association with demographic, socioeconomic and behavioral, indicators of nutritional status variables.
  
  
  METHODS
  Cross-sectional study with a representative sample of 991 adolescents (54.5% girls) from both public and private high schools selected through multi stage random sampling. The level of habitual physical activity was verified through the IPAQ modified for adolescents, using the last week as a reference period. Physical inactivity was defined as <300 min/wk of moderate and vigorous physical activity. The independent variables studied were: gender, age, type of high school, socioeconomic level, smoking, sedentary behavior (> 4 h/d), nutritional status and abdominal obesity.
  
  
  RESULTS
  Prevalence of physical inactivity among adolescents was 56.9% (girls = 57.9%, boys = 55.7%, p =. 046). The risk factors associated with physical inactivity were belonging to the lower socioeconomic level, studying at public schools and being obese.
  
  
  CONCLUSIONS
  We found a high prevalence of physical inactivity in the study. It is urgently necessary to develop strategies aimed at increasing physical activity, which can be achieved by development of an educational content that promotes healthy life styles.
authors.affiliation: Programa de pós-graduação em Ciências, Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP.
authors.forename: Augusto César Ferreira de
authors.initials: AC
authors.lastname: Moraes
authors.forename: Carlos Alexandre Molena
authors.initials: CA
authors.lastname: Fernandes
authors.forename: Rui Gonçalves Marques
authors.initials: RG
authors.lastname: Elias
authors.forename: Alika Terumi Arasaki
authors.initials: AT
authors.lastname: Nakashima
authors.forename: Felipe Fossati
authors.initials: FF
authors.lastname: Reichert
authors.forename: Mário Cícero
authors.initials: MC
authors.lastname: Falcão
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000502:physiology*; D001938:Brazil / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D009752:Nutritional Status / Q000502:physiology; D009765:Obesity / Q000150:complications; D017150:Public Sector / Q000706:statistics & numerical data; D012307:Risk Factors; D012574:Schools / Q000706:statistics & numerical data; D057185:Sedentary Behavior; D012959:Socioeconomic Factors