title: Alterations in growth and body composition during puberty. IV. Energy intake estimated by the youth-adolescent food-frequency questionnaire: validation by the doubly labeled water method.
abstract: BACKGROUND
  Estimates of energy intake are required for an understanding of growth and disease; however, few methods of energy intake in children have been validated.
  
  
  OBJECTIVE
  Our objective was to validate energy intake estimated by the Youth-Adolescent Food-Frequency Questionnaire (YAQ) against the criterion total energy expenditure (TEE) by doubly labeled water (DLW).
  
  
  METHODS
  Twenty-three boys and 27 girls (8.6-16.2 y of age) completed the YAQ and TEE measurements in 1 y.
  
  
  RESULTS
  Energy intake by the YAQ (10. 03 +/- 3.12 MJ) and energy expenditure by DLW (9.84 +/- 1.79 MJ) were similar (P: = 0.91) with large lower (-6.30 MJ) and upper (6.67 MJ) +/-2 SD limits of agreement. When within-subject CVs of repeated measures of the DLW and YAQ methods were used, 25 of the 50 subjects were deemed to have misreported their energy intake. The discrepancy in energy intake (YAQ - TEE) was related to body weight (r = -0.25, P: = 0.077) and percentage body fat (r = -0.24, P: = 0.09) but not to age (r = -0.07, P: = 0.63) or the time between measures. From logistic regression, fatter boys were more likely to underreport energy intake than were fatter girls.
  
  
  CONCLUSIONS
  The YAQ provides an accurate estimation of mean energy intake for a group but not for an individual.
authors: Department of Pediatrics, Division of Endocrinology, The General Clinical Research Center, University of Virginia, Charlottesville, VA, USA.
authors: S M
authors: SM
authors: Perks
authors: J N
authors: JN
authors: Roemmich
authors: M
authors: M
authors: Sandow-Pajewski
authors: P A
authors: PA
authors: Clark
authors: E
authors: E
authors: Thomas
authors: A
authors: A
authors: Weltman
authors: J
authors: J
authors: Patrie
authors: A D
authors: AD
authors: Rogol
mesh_terms: D000293:Adolescent; D001823:Body Composition; D002648:Child; D003430:Cross-Sectional Studies; D017666:Deuterium Oxide; D004032:Diet; D002149:Energy Intake; D004734:Energy Metabolism; D005260:Female; D006128:Growth; D006801:Humans; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D009753:Nutritive Value; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires
chemical_list: D017666:Deuterium Oxide