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Agreement between a brief food frequency questionnaire and diet records using two statistical methods

Published online by Cambridge University Press:  27 September 2007

GL Ambrosini ,
NH de Klerk ,
AW Musk  and
D Mackerras
GL Ambrosini*
Affiliation:
Department of Public Health, University of Western Australia, Nedlands Campus, Perth, W.A. 6907, Australia
NH de Klerk
Affiliation:
Department of Public Health, University of Western Australia, Nedlands Campus, Perth, W.A. 6907, Australia
AW Musk
Affiliation:
Department of Public Health, University of Western Australia, Nedlands Campus, Perth, W.A. 6907, Australia Department of Respiratory Medicine, Sir Charles Gairdner Hospital, Perth, W.A., Australia Department of Medicine, University of Western Australia, Perth, W.A., Australia
D Mackerras
Affiliation:
Menzies School of Health Research, Darwin, N.T., Australia
*
*Corresponding author: Email ginaa@dph.uwa.edu.au
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Abstract

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Objective

To compare intra- and inter-method reliability of a semi-quantitative food frequency questionnaire (FFQ) designed specifically to measure beta carotene (BC) and retinol intake, using two methods – the limits of agreement (LOA) and the correlation coefficient.

Design

A cross-sectional study of dietary intake.

Setting

A randomized trial of vitamin A supplements in 2769 subjects with past asbestos exposure.

Subjects

Data from 57 men and 26 women, aged 28–72 years, living in Western Australia.

Methods

The FFQ was administered at baseline (FFQ1) and repeated 1 year later (FFQ2). Four 1-week diet records (DRs) were completed during the year.

Results

Mean agreement between FFQ2 and FFQ1 was 120% for BC and 98% for retinol. LOA were 47–306% and 21–459%, respectively. Mean agreement between FFQ2 and the DR was 149% for BC and 63% for retinol; LOA were 50–447% and 11–349%, respectively. Mean agreement and LOA varied across energy intakes. Between the DR and FFQ2, correlation coefficients were 0.36 for BC and 0.51 for retinol. These varied considerably across age, gender and energy intakes and were not in accordance with limits of agreement findings.

Conclusion

Although correlation coefficients were positive and significant, there was less than ideal intra-method and inter-method reliability shown by the limits of agreement method. Bias was uneven across the range of intakes, the LOA were wide and, compared with the DR, the FFQ significantly over-estimated BC and under-estimated retinol. This shows the limitations of calculating correlation coefficients alone, for assessing reliability and validity.

Keywords

Food frequency questionnaireDiet recordsReliabilityValidityReproducibilityNutritional epidemiologyVitamin A
Type
Research Article
Information
Public Health Nutrition , Volume 4 , Issue 2 , April 2001 , pp. 255 - 264
Copyright
Copyright © CABI Publishing 2001

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