title: Number of days needed to assess energy and nutrient intake in infants and young children between 6 months and 2 years of age.
abstract: OBJECTIVE
  To estimate the minimum number of days of recorded dietary intake needed to place infants and young children into thirds of a population distribution with an acceptable degree of accuracy.
  
  
  METHODS
  Dietary intake data collected from 5-day weighed food records for 72 infants and young children up to 2 y of age, collected during a cross-sectional study, were analysed to estimate the number of recording days necessary to assess intake of energy and 10 nutrients.
  
  
  METHODS
  Community study among healthy infants and children.
  
  
  METHODS
  Parents attended recruitment sessions in local community areas. In total, 72 subjects were entered into the study and all completed the 5-day dietary assessment period.
  
  
  METHODS
  A 5-day weighed record of children's dietary intake was made by the parents or regular carer.
  
  
  RESULTS
  Mean within subject standard deviations were smaller than mean between subject standard deviations with respect to energy (778 vs 824 kJ/day), macronutrient subclasses: protein (8 vs 9.4 g/day); fat (9 vs 10 g/day); and carbohydrate (26 vs 29 g/day) and for specific micronutrients: calcium (163 vs 236 mg/day); phosphorus (143 vs 270 mg/day); magnesium (25 vs 43 mg/day); iron (2 vs 3 mg/day); zinc (1 vs 1.3 mg/day); ascorbic acid (27 vs 64 mg/day) and retinol equivalents (281 vs 424 microg/day). Estimated number of days of food records necessary to assess intake of energy, protein, fat and carbohydrate with acceptable degree of accuracy were 5,4,4 and 3, respectively. For all the micronutrients included in this analysis 2 days of recording were necessary.
  
  
  CONCLUSIONS
  Compared with adults and older children, fewer days are needed to classify this age group into thirds of the distribution with an acceptable degree of accuracy according to intake of energy and specific nutrients.
  
  
  BACKGROUND
  The data collection phase of this study was supported by a grant from the Procter and Gamble Company, Cincinnati, OH, USA.
authors.affiliation: MRC-Childhood Nutrition Research Centre, Institute of Child Health, London, UK. j.lanigan@ich.ucl.ac.uk
authors.forename: J A
authors.initials: JA
authors.lastname: Lanigan
authors.forename: J C K
authors.initials: JC
authors.lastname: Wells
authors.forename: M S
authors.initials: MS
authors.lastname: Lawson
authors.forename: T J
authors.initials: TJ
authors.lastname: Cole
authors.forename: A
authors.initials: A
authors.lastname: Lucas
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D015930:Diet Records; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004041:Dietary Fats / Q000008:administration & dosage*; D004044:Dietary Proteins / Q000008:administration & dosage*; D002149:Energy Intake; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D018977:Micronutrients / Q000008:administration & dosage*; D015596:Nutrition Assessment; D015203:Reproducibility of Results; D013997:Time Factors
chemical_list: D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004044:Dietary Proteins; D018977:Micronutrients