title: Associations between reported intakes of carotenoid-rich foods and concentrations of carotenoids in plasma: a validation study of a web-based food recall for children and adolescents.
abstract: To validate estimated intakes of carotenoid-rich foods from a web-based food recall (WebFR) using carotenoids in blood as an objective reference method.
  
  
  
  Cross-sectional validation study using carotenoids in plasma to evaluate estimated intakes of selected carotenoid-rich foods. Participants recorded their food intake in the WebFR and plasma concentrations of β-carotene, α-carotene, β-cryptoxanthin, lycopene, lutein and zeaxanthin were measured.
  
  
  
  Schools and homes of families in a suburb of the capital of Norway.
  
  
  
  A total of 261 participants in the age groups 8-9 and 12-14 years.
  
  
  
  Spearman's rank correlation coefficients ranged from 0·30 to 0·44, and cross-classification showed that 71·6-76·6 % of the participants were correctly classified, when comparing the reported intakes of carotenoid-rich foods and concentrations of the corresponding carotenoids in plasma, not including lutein and zeaxanthin.
  
  
  
  Correlations were acceptable and cross-classification analyses demonstrated that the WebFR was able to rank participants according to their reported intake of foods rich in α-carotene, β-carotene, β-cryptoxanthin and lycopene. The WebFR is a promising tool for dietary assessment among children and adolescents.
authors.affiliation: Institute of Basic Medical Sciences, Faculty of Medicine,University of Oslo,Postboks 1046,Blindern,NO N-0317 OSLO,Norway.
authors.forename: Anine Christine
authors.initials: AC
authors.lastname: Medin
authors.affiliation: Institute of Basic Medical Sciences, Faculty of Medicine,University of Oslo,Postboks 1046,Blindern,NO N-0317 OSLO,Norway.
authors.forename: Monica Hauger
authors.initials: MH
authors.lastname: Carlsen
authors.affiliation: Institute of Basic Medical Sciences, Faculty of Medicine,University of Oslo,Postboks 1046,Blindern,NO N-0317 OSLO,Norway.
authors.forename: Lene Frost
authors.initials: LF
authors.lastname: Andersen
mesh_terms: D000293:Adolescent; D002338:Carotenoids / Q000097:blood*; D002648:Child; D003430:Cross-Sectional Studies; D065366:Cryptoxanthins; D004032:Diet; D004034:Diet Surveys; D005260:Female; D006801:Humans; D020407:Internet; D014975:Lutein; D008297:Male; D009664:Norway; D024341:Xanthophylls
chemical_list: D065366:Cryptoxanthins; D024341:Xanthophylls; D002338:Carotenoids; D014975:Lutein
keywords: Carotenoids; Children; Dietary assessment; Internet; Validation studies