Document Detail

The validity of dietary assessment in general practice.
MedLine Citation:
PMID:  10396494     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To validate a range of dietary assessment instruments in general practice. METHODS: Using a randomised block design, brief assessment instruments and more complex conventional dietary assessment tools were compared with an accepted "relative" standard--a seven day weighed dietary record. The standard was checked using biomarkers, and by performing test-retest reliability in additional subjects (n = 29). OUTCOMES: Agreement with weighed record. Percentage agreement with weighed record, rank correlation from scatter plot, rank correlation from Bland-Altman plot. Reliability of the weighed record. SETTING: Practice nurse treatment room in a single suburban general practice. SUBJECTS: Patients with risk factors for cardiovascular disease (n = 61) or age/sex stratified general population group (n = 50). RESULTS: Brief self completion dietary assessment tools based on food groups caten during a week show reasonable agreement with the relative standard. For % energy from fat and saturated fat, non-starch polysaccharide, grams of fruit and vegetables and starchy foods consumed the range of agreement with the standard was: median % difference -6% to 12%, rank correlation 0.5 to 0.6. This agreement is of a similar order to the reliability of the weighed record, as good as or better than test standard agreement for more time consuming instruments, and compares favourably with research instruments validated in other settings. Under-reporting of energy intake was common (40%) and more likely if subjects were obese (body mass idex (BMI) > or = 30 60% under-reported; BMI < 30 29%, p < 0.001). CONCLUSION: Under-reporting of absolute energy intake is common, particularly among obese patients. Simple self assessment tools based on food groups, designed for practice nurse dietary assessment, show acceptable agreement with a standard, and suggest such tools are sufficiently accurate for clinical work, research, and possibly population dietary monitoring.
P Little; J Barnett; B Margetts; A L Kinmonth; J Gabbay; R Thompson; D Warm; H Warwick; S Wooton
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of epidemiology and community health     Volume:  53     ISSN:  0143-005X     ISO Abbreviation:  J Epidemiol Community Health     Publication Date:  1999 Mar 
Date Detail:
Created Date:  1999-08-04     Completed Date:  1999-08-04     Revised Date:  2010-08-25    
Medline Journal Info:
Nlm Unique ID:  7909766     Medline TA:  J Epidemiol Community Health     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  165-72     Citation Subset:  IM    
Primary Medical Care Group, University of Southampton.
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MeSH Terms
Aged, 80 and over
Diet Records*
Energy Intake
Family Practice*
Great Britain
Middle Aged
Random Allocation
Reproducibility of Results
Grant Support
//Wellcome Trust

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