Number of days of food intake records required to estimate individual and group nutrient intakes with defined confidence

Food intake records for 365 consecutive days of a research study conducted by the U.S. Department of Agriculture's Beltsville Human Nutrition Research Center were used to determine the number of days of food intake records needed to estimate "true" average nutrient intakes for 29 indi...

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Bibliographic Details
Published inThe Journal of nutrition Vol. 117; no. 9; pp. 1638 - 1641
Main Authors Basiotis, P.P, Welsh, S.O, Cronin, F.J, Kelsay, J.L, Mertz, W
Format Journal Article
LanguageEnglish
Published Bethesda, MD American Society for Nutritional Sciences 01.09.1987
Subjects
ABSORCION DE SUBSTANCIAS NUTRITIVAS
ABSORPTION DE SUBSTANCES NUTRITIVES
Adult
ANALISIS ESTADISTICO
ANALYSE STATISTIQUE
Biological and medical sciences
CONCEPTION
Data Collection
Diet
Diet Surveys
DISENO
Energy Intake
EXPERIMENTATION
EXPERIMENTOS
Female
FEMME
HOMBRES
HOMME
Humans
INGESTION DE ALIMENTOS
Male
Medical sciences
METHODE
METODOS
MUJERES
Nutrition Surveys
PRISE ALIMENTAIRE
Statistics as Topic
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Surgery of the eye and orbit
Time Factors
Vitamin A - administration & dosage
Human
Method
Inquiry
Food intake
Food
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Summary:Food intake records for 365 consecutive days of a research study conducted by the U.S. Department of Agriculture's Beltsville Human Nutrition Research Center were used to determine the number of days of food intake records needed to estimate "true" average nutrient intakes for 29 individuals (13 males and 16 females) and groups of individuals with a given degree of statistical confidence or precision. Precision is defined as X-day average intake being within 10% of the "true average" intake for the individual or the group 95% of the time. True average intake was defined as the 365-day average for individuals or groups. The average number of days required to estimate true average food energy, iron and vitamin A intake with defined confidence were: food energy averaged 31 days and vitamin A averaged 433. This was consideralby higher than the number of days needed to estimate mean nutrient intake for this group; however, fewer days would be need for larger groups
Bibliography:8845565
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ISSN:0022-3166
1541-6100
DOI:10.1093/jn/117.9.1638