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Reproducibility of a short semi-quantitative food group questionnaire and its performance in estimating nutrient intake compared with a 7-day diet diary in the Million Women Study

Published online by Cambridge University Press:  02 January 2007

Andrew W Roddam ,
Elizabeth Spencer ,
Emily Banks ,
Valerie Beral ,
Gillian Reeves ,
Paul Appleby ,
Isobel Barnes ,
David C Whiteman  and
Timothy J Keyal
Andrew W Roddam*
Affiliation:
Cancer Research UK Epidemiology Unit, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, UK
Elizabeth Spencer
Affiliation:
Cancer Research UK Epidemiology Unit, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, UK
Emily Banks
Affiliation:
National Centre for Epidemiology & Population Health, Australian National University, Canberra, Australia
Valerie Beral
Affiliation:
Cancer Research UK Epidemiology Unit, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, UK
Gillian Reeves
Affiliation:
Cancer Research UK Epidemiology Unit, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, UK
Paul Appleby
Affiliation:
Cancer Research UK Epidemiology Unit, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, UK
Isobel Barnes
Affiliation:
School of Applied Statistics, University of Reading, Reading, UK
David C Whiteman
Affiliation:
Division of Population Studies and Human Genetics, Queensland Institute of Medical Research, Brisbane, Australia
Timothy J Keyal
Affiliation:
Cancer Research UK Epidemiology Unit, University of Oxford, Radcliffe Infirmary, Oxford OX2 6HE, UK
*
*Corresponding author: Email [email protected]
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Abstract

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Objectives

To assess the short- and long-term reproducibility of a short food group questionnaire, and to compare its performance for estimating nutrient intakes in comparison with a 7-day diet diary.

Design

Participants for the reproducibility study completed the food group questionnaire at two time points, up to 2 years apart. Participants for the performance study completed both the food group questionnaire and a 7-day diet diary a few months apart. Reproducibility was assessed by kappa statistics and percentage change between the two questionnaires; performance was assessed by kappa statistics, rank correlations and percentages of participants classified into the same and opposite thirds of intake.

Setting

A random sample of participants in the Million Women Study, a population-based prospective study in the UK.

Subjects

In total, 12 221 women aged 50–64 years.

Results

In the reproducibility study, 75% of the food group items showed at least moderate agreement for all four time-point comparisons. Items showing fair agreement or worse tended to be those where few respondents reported eating them more than once a week, those consumed in small amounts and those relating to types of fat consumed. Compared with the diet diary, the food group questionnaire showed consistently reasonable performance for the nutrients carbohydrate, saturated fat, cholesterol, total sugars, alcohol, fibre, calcium, riboflavin, folate and vitamin C.

Conclusions

The short food group questionnaire used in this study has been shown to be reproducible over time and to perform reasonably well for the assessment of a number of dietary nutrients.

Keywords

DietDietary assessmentFoodNutritionEpidemiological method
Type
Research Article
Information
Public Health Nutrition , Volume 8 , Issue 2 , April 2005 , pp. 201 - 213
Copyright
Copyright © The Authors 2005

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