title: Evaluation of photographs supporting an FFQ developed for adolescents.
abstract: OBJECTIVE
  To evaluate the validity of food photographs used to support the reporting of food intake with an FFQ designed for adolescents from Rio de Janeiro, Brazil.
  
  
  METHODS
  A set of ninety-five food photographs was elaborated. The photographs' evaluation process included the acknowledgement of foods and portions in the pictures. In the identification of foods (ninety-five photographs) and typical portions (twelve photographs), the adolescents were requested to answer a structured questionnaire related to the food photographs. The identification of the portion size of amorphous foods (forty-three photographs) was performed using three different portion sizes of actual preparations. The proportions (and 95% confidence intervals) of adolescents who correctly identified foods and portion size in each photograph were estimated.
  
  
  METHODS
  A public school in Niterói, Rio de Janeiro State, Brazil.
  
  
  METHODS
  Sixty-two adolescents between 11·0 and 18·9 years old, randomly selected.
  
  
  RESULTS
  At least 90% of adolescents correctly identified the food in ninety-two photographs and the food in the three remaining photographs was recognized by 80-89% of the adolescents. At least 98% of the adolescents correctly identified eleven typical or natural portions in the food photographs. For amorphous foods, at least 70% of teenagers correctly identified the portion size in the photograph of thirty-one foods; for the other photographs, the portion size was correctly recognized by 50-69% of the adolescents for eight foods and by less than 50% of adolescents for four foods.
  
  
  CONCLUSIONS
  The analysed photographs are appropriate visual aids to the reporting of food consumption by adolescents.
authors.affiliation: 1 Departamento de Nutrição Social e Aplicada, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho 373, Edifício do Centro de Ciências da Saúde, Bloco J, 2° andar, Rio de Janeiro, RJ 21941-902, Brazil.
authors.forename: Alessandra Page
authors.initials: AP
authors.lastname: Brito
authors.affiliation: 2 Departamento de Comunicação Visual, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
authors.forename: Celso Pereira
authors.initials: CP
authors.lastname: Guimarães
authors.affiliation: 1 Departamento de Nutrição Social e Aplicada, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho 373, Edifício do Centro de Ciências da Saúde, Bloco J, 2° andar, Rio de Janeiro, RJ 21941-902, Brazil.
authors.forename: Rosangela Alves
authors.initials: RA
authors.lastname: Pereira
mesh_terms: D000293:Adolescent; D001938:Brazil; D002648:Child; D002149:Energy Intake; D005260:Female; D006801:Humans; D008297:Male; D010781:Photography; D064787:Portion Size; D012858:Size Perception; D011795:Surveys and Questionnaires