title: Comparison of single questions and brief questionnaire with longer validated food frequency questionnaire to assess adequate fruit and vegetable intake.
abstract: OBJECTIVE
  The aim of this study was to determine if a single question (SQ) for fruit and a SQ or five-item questionnaire for vegetable consumption (VFQ) could replace a longer food frequency questionnaire (FFQ) to screen for inadequate versus adequate intakes in populations.
  
  
  METHODS
  Participants (109) completed three test screeners: fruit SQ, vegetable SQ, and a five-item VFQ followed by the reference 74-item FFQ (version 2 of the Dietary Questionnaire for Epidemiological Studies [DQESv2]) including 13 fruit and 25 vegetable items. The five-item VFQ asked about intake of salad vegetables, cooked vegetables, white potatoes, legumes, and vegetable juice. The screeners were compared with the reference (DQESv2 FFQ) for sensitivity, specificity, and positive and negative predictive powers (PPV, NPV) to detect intakes of two or more servings of fruit and three or more servings of vegetables. Relative validity was examined using Bland-Altman statistics.
  
  
  RESULTS
  The fruit SQ showed a PPV of 56% and an NPV of 83%. The PPV for the vegetable SQ was 30% and the NPV was 89%. For the five-item VFQ, the PPV was 39% and the NPV was 85%. Bland-Altman plots and linear regression equations showed that although the screener showed good agreement for fruit (unstandardized b1 coefficient = 0.04) for vegetable intake the difference between methods increased at higher intake levels (unstandardized b1 coefficients = -0.3 for the SQ, b1 = -0.6 for five-item VFQ).
  
  
  CONCLUSIONS
  The fruit SQ and the five-item VFQ are suitable replacements for longer FFQs to detect inadequate intake and assess population mean but not individual intakes.
authors.affiliation: School of Molecular Bioscience, The Charles Perkins Centre, University of Sydney New South Wales, Australia.
authors.forename: Amelia
authors.initials: A
authors.lastname: Cook
authors.affiliation: School of Molecular Bioscience, The Charles Perkins Centre, University of Sydney New South Wales, Australia.
authors.forename: Kia
authors.initials: K
authors.lastname: Roberts
authors.affiliation: School of Molecular Bioscience, The Charles Perkins Centre, University of Sydney New South Wales, Australia.
authors.forename: Fiona
authors.initials: F
authors.lastname: O'Leary
authors.affiliation: School of Molecular Bioscience, The Charles Perkins Centre, University of Sydney New South Wales, Australia. Electronic address: margaret.allmanfarinelli@sydney.edu.au.
authors.forename: Margaret Anne
authors.initials: MA
authors.lastname: Allman-Farinelli
mesh_terms: D000328:Adult; D004032:Diet / Q000706:statistics & numerical data*; D004034:Diet Surveys / Q000379:methods*; D005247:Feeding Behavior; D005260:Female; D005638:Fruit; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D014675:Vegetables
keywords: Fruit; Short food frequency questionnaire; Vegetables