Linked Life Data

3239967

Source:http://linkedlifedata.com/resource/pubmed/id/3239967

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1989-5-3
pubmed:abstractText
While several studies have examined the validity of the 24-hour recall as a method for assessment of dietary intake in older people, none has examined the components of variability of dietary data obtained from the 24-hour recalls of older adults. The ability to detect differences in group means, and estimates of correlation and regression coefficients, are all reduced when intraindividual (within-subject) variability in a measure is large in comparison to interindividual (between-subject) variability. The present study considered the components of variance of four 24-hour diet recalls taken bimonthly, for 220 adults whose mean age was 72 years. Two components of variability were estimated for 23 nutritional variables: an interindividual (between-subjects) variance component and an intraindividual (within-subjects) variance component. The ratio of intraindividual to interindividual variance differed substantially as a function of the nutritional parameter being assessed. Methods are presented for determining the number of dietary recalls needed to keep the attenuation of correlation and regression coefficients within a specified level. Power calculations for the test of equal means in two independent groups are also presented.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0195-6663
pubmed:author
pubmed:issnType
Print
pubmed:volume
11
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
97-110
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
Interindividual and intraindividual variation in repeated measures of 24-hour dietary recall in the elderly.
pubmed:affiliation
Department of Psychology, Yale University, New Haven, CT 06520.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.