An investigation of the validity and reliability of a food intake questionnaire

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Abstract:

Aims

To evaluate the reliability and criterion validity of a food intake questionnaire (FIQ) designed for use in schoolchildren. Methods

Study of reliability: 98 young people aged 13–14 years attending two schools in deprived areas of Liverpool completed the FIQ on three separate occasions over a 3-month period. Validity study

Ninety-six young people (aged 11–13 years) completed the FIQ and 2 weeks later completed a 3-day food diary (with interview). Results

The FIQ gave consistent response on separate occasions over the 3-month reliability study period. Levels of agreement were consistent between survey combinations. Analysis of variance showed no differences in mean score for food groups between surveys. Pearson correlations for mean scores estimated by separate FIQ ranged from 0.42 for fibre food group to 0.76 for negative marker food group; the majority of the correlations were above 0.5. The data suggested the FIQ should be able to detect a change of ±10% in eating habits. The validity study provided modest but significant Pearson correlations between energy intake, fat intake as a percentage of energy intake and sugars intake derived from 3-day diaries, and mean scores for the fatty, sugary and negative marker food group assessed by the FIQ. Conclusions

The results from both studies provide an indication of the FIQ’s reliability, and suggest it has criterion validity for fatty and sugary and negative marker foods.

Keywords: dietary questionnaire; reliability; validity

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1365-277X.2001.00320.x

Affiliations: 1: Department of Community Nutrition and Dietetics, Abercromby Health Centre, Grove St., Liverpool L7 7HG, UK, 2: Reader in Community Nutrition, School of Education & Community Studies, Liverpool John Moores University, IM Marsh Campus, Barkhill Road, Aigburth, Liverpool L7 6BD, UK, 3: Department of Mathematics and Computing, Liverpool John Moores University, Byrom St., Liverpool, UK, 4: Department of Health Studies, University of Central Lancashire, Preston PC1 2HE, UK

Publication date: December 1, 2001

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