title: Patterns of physical activity and associated factors among teenagers from Barcelona (Spain) in 2012.
abstract: OBJECTIVE
  To estimate the prevalence of moderate and vigorous physical activity (MVPA), as defined by the World Health Organisation (WHO), and associated factors among teenagers from Barcelona in 2012.
  
  
  METHODS
  Cross-sectional survey to assess risk factors in a representative sample of secondary school students (aged 13-16 years, International Standard Classification of Education [ISCED] 2, n=2,162; and 17-18 years, ISCED 3, n=1016) in Barcelona. We estimated MVPA prevalence overall, and for each independent variable and each gender. Poisson regression models with robust variance were fit to examine the factors associated with high-level MVPA, and obtained prevalence ratios (PR) and 95% confidence intervals (95%CI).
  
  
  RESULTS
  Only 13% of ISCED 2 and 10% of ISCED 3 students met the WHO physical activity recommendations. This percentage was lower among girls at both academic levels. MVPA was lower among ISCED 3 compared to ISCED 2 students, and among students with a lower socioeconomic status. Physical activity was associated with positive self-perception of the health status (e.g., positive self-perception of health status among ISCED 2 compared to ISCED 3 students: PR=1.31 [95%CI: 1.22-1.41] and 1.61 [95%CI: 1.44-1.81] for boys and girls, respectively].
  
  
  CONCLUSIONS
  The percentage of teenagers who met WHO MVPA recommendations was low. Strategies are needed to increase MVPA levels, particularly in older girls, and students from low socioeconomic backgrounds.
authors.affiliation: Agència de Salut Pública de Barcelona, Barcelona, Spain; Institut d'Investigació Biomèdica Sant Pau, Barcelona, Spain.
authors.forename: Alicia
authors.initials: A
authors.lastname: Ruiz-Trasserra
authors.affiliation: Agència de Salut Pública de Barcelona, Barcelona, Spain; Institut d'Investigació Biomèdica Sant Pau, Barcelona, Spain; CIBER de Epidemiología y Salud Pública (CIBERESP), Spain. Electronic address: aperez@aspb.cat.
authors.forename: Anna
authors.initials: A
authors.lastname: Pérez
authors.affiliation: Agència de Salut Pública de Barcelona, Barcelona, Spain; Institut d'Investigació Biomèdica Sant Pau, Barcelona, Spain; CIBER de Epidemiología y Salud Pública (CIBERESP), Spain.
authors.forename: Xavier
authors.initials: X
authors.lastname: Continente
authors.affiliation: Behavioural Studies, Monash University, Melbourne, Victoria, Australia.
authors.forename: Kerry
authors.initials: K
authors.lastname: O'Brien
authors.affiliation: Agència de Salut Pública de Barcelona, Barcelona, Spain; Institut d'Investigació Biomèdica Sant Pau, Barcelona, Spain.
authors.forename: Montse
authors.initials: M
authors.lastname: Bartroli
authors.affiliation: Agència de Salut Pública de Barcelona, Barcelona, Spain; Institut d'Investigació Biomèdica Sant Pau, Barcelona, Spain.
authors.forename: Ester
authors.initials: E
authors.lastname: Teixidó-Compaño
authors.affiliation: Agència de Salut Pública de Barcelona, Barcelona, Spain; Institut d'Investigació Biomèdica Sant Pau, Barcelona, Spain; CIBER de Epidemiología y Salud Pública (CIBERESP), Spain; Departament de Psicobiologia i Metodologia de les Ciències de la Salut, Universitat Autònoma de Barcelona, Bellaterra (Barcelona), Spain.
authors.forename: Albert
authors.initials: A
authors.lastname: Espelt
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D003430:Cross-Sectional Studies; D004522:Educational Status; D015444:Exercise; D005260:Female; D006184:Habits; D006801:Humans; D008019:Life Style; D008297:Male; D000297:Psychology, Adolescent; D012307:Risk Factors; D057185:Sedentary Behavior; D012737:Sex Factors; D012959:Socioeconomic Factors; D013030:Spain
keywords: Adolescence; Adolescencia; Cross-sectional studies; Ejercicio; Encuesta de salud; Estudios transversales; Exercise; Gender identity; Health survey; Identidad de género