title: Estimated portion sizes in a school-aged population.
abstract: OBJECTIVE
  To produce study-specific portion sizes for 11-year-old children in a population-based birth cohort and to compare these study-specific portion sizes with previously published children's portion sizes, to assess their relevance today.
  
  
  METHODS
  Two multiple-pass 24 h dietary recalls were taken. The Food Standard Agency's photographic food atlas was used to quantify intakes. Study-specific food portion sizes were calculated for each food group. Portion sizes were calculated for all children and separately for boys and girls. The nutrient intake from the 24 h dietary recalls was analysed using study-specific and published portion sizes for individual participants. Agreement was assessed using Pearson's correlation, intra-class correlation coefficients and the Bland-Altman method.
  
  
  METHODS
  Birth cohort study, UK.
  
  
  METHODS
  Children (mean age 11.3 years, n 264) and parents/guardians.
  
  
  RESULTS
  A total of 124 food portion sizes were calculated. Differences in portion weights between boys and girls were seen only for seven food items. There was a significant positive relationship (P < 0.001) between intakes of each nutrient as determined by the two sets of portion sizes. Correlation coefficients ranged from 0.77 (protein) to 0.98 (β-carotene). The intra-class correlation coefficients showed good agreement between nutrient intakes determined by the study-specific and published portion sizes (P < 0.001).
  
  
  CONCLUSIONS
  Nutrient intakes calculated using portion sizes from our population were similar to those calculated from portion size data collected in a national survey, despite being collected over a decade later. The present study adds to the small amount of evidence regarding portion sizes in UK children and shows agreement with previously published paediatric portion sizes.
authors.affiliation: School of Translational Medicine, University of Manchester and NIHR Translational Research Facility in Respiratory Medicine, University Hospital of South Manchester NHS Foundation Trust, Manchester, UK.
authors.forename: Sumaiya
authors.initials: S
authors.lastname: Patel
authors.forename: Avni
authors.initials: A
authors.lastname: Vyas
authors.forename: Adnan
authors.initials: A
authors.lastname: Custovic
authors.forename: Clare S
authors.initials: CS
authors.lastname: Murray
mesh_terms: D002648:Child; D015331:Cohort Studies; D004032:Diet; D015930:Diet Records; D004034:Diet Surveys; D002149:Energy Intake; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall; D012737:Sex Factors; D006113:United Kingdom