Within- and between-individual variation in energy intakes by low-income Peruvian infants

E. G. Piwoz, H. C. De Kanashiro, G. L. De Romana, Robert E Black, K. H. Brown

Research output: Contribution to journalArticle

Abstract

Objectives: (i) To examine the components of variation in infant energy intake. (ii) To calculate the precision of estimates of energy intake from different sources. (iii) To estimate the number of dietary studies required to estimate true energy intake with varying degrees of precision. Design: Energy intakes were determined from monthly 12-h observations with test-weighing of breastmilk and all foods consumed. Variance components were evaluated by pooling results of studies performed when infants were 1-4, 5-8 and 9-12 months old. Setting: Pueblo Joven Huascar, a low-income, peri-urban community in Lima, Peru. Subjects: 124 infants who were enrolled at birth and followed monthly. Results: Within-to-between infant variance ratios were > 1.0 for total energy and energy from solid foods, and <1.0 for energy from breast- and non-human milks during the 4-month periods examined. Total energy and energy from breastmilk were estimated to within 13-24% of infants' true intake. Non-breastmilk energy was estimated to within 19-143% of true intake. Four dietary studies per age period are required to estimate total energy and breastmilk energy consumption with 20-30% precision. At least 16 studies are required to estimate infants' average energy intake from solid foods from 5-8 months with 30% precision. Conclusions: The degree of precision achieved during assessment of infants' usual energy intake changes with age and composition of the diet. Thus, the number of dietary studies required to obtain a fixed level of precision differs according to these characteristics.

Original languageEnglish (US)
Pages (from-to)333-340
Number of pages8
JournalEuropean Journal of Clinical Nutrition
Volume48
Issue number5
StatePublished - 1994

Fingerprint

Energy Intake
energy intake
income
energy
diet study techniques
Food
Peru
Human Milk
breast milk
Parturition
Diet
diet
testing

Keywords

  • Breastfeeding
  • Dietary assessment
  • Energy intake
  • Infants
  • Variance
  • Weaning

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Food Science

Cite this

Piwoz, E. G., De Kanashiro, H. C., De Romana, G. L., Black, R. E., & Brown, K. H. (1994). Within- and between-individual variation in energy intakes by low-income Peruvian infants. European Journal of Clinical Nutrition, 48(5), 333-340.

Within- and between-individual variation in energy intakes by low-income Peruvian infants. / Piwoz, E. G.; De Kanashiro, H. C.; De Romana, G. L.; Black, Robert E; Brown, K. H.

In: European Journal of Clinical Nutrition, Vol. 48, No. 5, 1994, p. 333-340.

Research output: Contribution to journalArticle

Piwoz, EG, De Kanashiro, HC, De Romana, GL, Black, RE & Brown, KH 1994, 'Within- and between-individual variation in energy intakes by low-income Peruvian infants', European Journal of Clinical Nutrition, vol. 48, no. 5, pp. 333-340.
Piwoz, E. G. ; De Kanashiro, H. C. ; De Romana, G. L. ; Black, Robert E ; Brown, K. H. / Within- and between-individual variation in energy intakes by low-income Peruvian infants. In: European Journal of Clinical Nutrition. 1994 ; Vol. 48, No. 5. pp. 333-340.
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