title: [Perceived barriers to active commuting to school: reliability and validity of a scale].
abstract: OBJECTIVE
  To examine the reliability and validity of a scale to measure perceived barriers to active commuting to school among Spanish young people.
  
  
  METHODS
  The validity of the scale was assessed in a sample of 465 adolescents (14-18 years) using a confirmatory factor analysis and studying its association with self-reported active commuting to school. The reliability of the instrument was evaluated in a sub-sample that completed the scale twice separated by a one-week interval.
  
  
  RESULTS
  The results showed that the barriers scale had satisfactory fit indices, and two factors were determined. The first included environment- and safety-related items (α=0.72), while the other concerned planning and psychosocial items (α=0.64). Active commuting to school showed significant correlations with the total score of the barriers scale (rho=-0.27; p <0.001), with the environmental/safety barriers (rho=-0.22; p <0.001), as well as with the planning/psychosocial barriers (rho=-0.29; p <0.001). Test-retest ICCs for the barriers ranged from 0.68 to 0.77.
  
  
  CONCLUSIONS
  The developed scale has acceptable validity and good reliability to assess barriers to active commuting to school among Spanish young people.
authors.affiliation: Departamento de Didáctica de la Expresión Musical, Plástica y Corporal, Universitat de València, Valencia, España; AFIPS (Activitat Física i Promoció de la Salut) Research Group, University of Valencia, Valencia, España. Electronic address: javier.molina@uv.es.
authors.forename: Javier
authors.initials: J
authors.lastname: Molina-García
authors.affiliation: AFIPS (Activitat Física i Promoció de la Salut) Research Group, University of Valencia, Valencia, España; Departamento de Enfermería, Universitat de València, Valencia, España.
authors.forename: Ana
authors.initials: A
authors.lastname: Queralt
authors.affiliation: Departamento de Didáctica de la Expresión Musical, Plástica y Corporal, Universitat de València, Valencia, España; AFIPS (Activitat Física i Promoció de la Salut) Research Group, University of Valencia, Valencia, España.
authors.forename: Isaac
authors.initials: I
authors.lastname: Estevan
authors.affiliation: AFIPS (Activitat Física i Promoció de la Salut) Research Group, University of Valencia, Valencia, España; Departamento de Psicología Social, Universitat de València, Valencia, España.
authors.forename: Octavio
authors.initials: O
authors.lastname: Álvarez
authors.affiliation: AFIPS (Activitat Física i Promoció de la Salut) Research Group, University of Valencia, Valencia, España; Departamento de Psicología Social, Universitat de València, Valencia, España.
authors.forename: Isabel
authors.initials: I
authors.lastname: Castillo
mesh_terms: D000293:Adolescent; D004777:Environment; D005163:Factor Analysis, Statistical; D006801:Humans; D015203:Reproducibility of Results; D012449:Safety; D012574:Schools; D011795:Surveys and Questionnaires; D014186:Transportation
keywords: Active commuting; Adolescentes; Adolescents; Ambiente; Environment; Neighbourhood; Transporte activo; Vecindario