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Reproducibility and validity of a food frequency questionnaire among fourth to seventh grade inner-city school children: implications of age and day-to-day variation in dietary intake

Published online by Cambridge University Press:  02 January 2007

Alison E Field*
Affiliation:
Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, USA
Karen E Peterson
Affiliation:
Department of Nutrition, Harvard School of Public Health, USA Department of Maternal and Child Health, Harvard School of Public Health, USA
Steve L Gortmaker
Affiliation:
Department of Health and Social Behavior, Harvard School of Public Health, USA
Lilian Cheung
Affiliation:
Department of Nutrition, Harvard School of Public Health, USA
Helaine Rockett
Affiliation:
Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, USA
Mary Kay Fox
Affiliation:
Abt Associates, USA
Graham A Colditz
Affiliation:
Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, USA Department of Epidemiology, Harvard School of Public Health, USA
*
*Corresponding author: Email: Alison.Field@channing.harvard.edu
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Abstract

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Objective

To assess the reproducibility and validity of a semiquantitative food frequency questionnaire (FFQ) to classify children and adolescents in terms of daily servings of fruits and vegetables and intake of calories, protein, fat, carbohydrate, dietary fibre, vitamin C, phosphorous, calcium and iron.

Design

FFQs were collected in the autumn of 1993 and 1994. Four 24-hour diet recalls were collected during the same 1-year period and their mean was compared to the FFQ diet estimates.

Setting

Low income, inner-city state schools.

Subjects

A sample of 109 inner-city fourth to seventh grade students.

Results

The 1-year reproducibility of the FFQ, assessed with Spearman correlations, was lower among the fourth and fifth (range: r = −0.26 to 0.40) than the sixth and seventh grade students (range: r = 0.18–0.47). After adjusting for day-to-day variation in dietary intake, for most nutrients and foods the correlations between the FFQ and the 24-hour recalls remained greater among the junior high school students (fourth to fifth grade range: r = 0.0–0.42; sixth to seventh grade range: = 0.07–0.76).

Conclusions

Inner-city sixth and seventh grade students demonstrated the ability to provide valid estimates of intake of calories, carbohydrate, calcium, phosphorous, iron and vitamin C over the past year. However, children in the fourth and fifth grades experienced some difficulty in completing the FFQ. Our results suggest that, before using this instrument with fourth and fifth grade children, investigators should assess whether study participants can think abstractly and are familiar with the concept of ‘average intake’.

Type
Research Article
Copyright
Copyright © CABI Publishing 1999

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