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Relative validity of a food frequency questionnaire used in the Inter99 study.
Eur J Clin Nutr. 2008 Aug; 62(8):1038-46.EJ

Abstract

OBJECTIVE

To evaluate the validity of the Inter99 food frequency questionnaire (FFQ) compared with a 28-days' diet history and biomarkers.

SUBJECTS

A random sample of 13 016 individuals were drawn from a general population and invited for a health screening programme. Participation rate was 52.5%. All high-risk individuals were re-invited for assessment after 1 and 3 years and completed a 198-item FFQ at all three occasions. Participants attending for 3 years follow-up were invited to participate in the validation study, including a 28-days' diet history, a 24-h urine collection and a fasting blood sample. Overall, 264 subjects participated.

RESULTS

Spearman's rank correlation coefficients between the two dietary methods ranged from 0.31(beta-carotene) to 0.64 (fruits) in men and from 0.31 (polyunsaturated fat and sodium) to 0.64 (fruits) for women. The proportion of individuals classified in the same or adjacent quintiles were, on average, 72% for men and 69% for women. Gross misclassification was found on average in 2%. The correlation coefficients of the residuals ranged from 0.27 (sodium) to 0.61 (fruits) for men and from 0.21 (sodium) to 0.62 (B12-vitamin) for women. Correlation coefficients between fruit and vegetable intake and carotenoids ranged from -0.08 (lycopene) to 0.44 (alpha-carotene). For the residuals the correlation coefficients ranged from -0.004 (lycopene) to 0.47 (alpha-carotene).

CONCLUSION

The Inter99 FFQ and the residuals of the intake provide acceptable classification of individuals according to their dietary intakes and the FFQ gives a good quantitative measurement of key dietary components.

Authors+Show Affiliations

Research Centre for Prevention and Health, Glostrup University Hospital, Glostrup, Denmark. ulto@glostruphosp.kbhamt.dkNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Validation Study

Language

eng

PubMed ID

17538538

Citation

Toft, U, et al. "Relative Validity of a Food Frequency Questionnaire Used in the Inter99 Study." European Journal of Clinical Nutrition, vol. 62, no. 8, 2008, pp. 1038-46.
Toft U, Kristoffersen L, Ladelund S, et al. Relative validity of a food frequency questionnaire used in the Inter99 study. Eur J Clin Nutr. 2008;62(8):1038-46.
Toft, U., Kristoffersen, L., Ladelund, S., Bysted, A., Jakobsen, J., Lau, C., Jørgensen, T., Borch-Johnsen, K., & Ovesen, L. (2008). Relative validity of a food frequency questionnaire used in the Inter99 study. European Journal of Clinical Nutrition, 62(8), 1038-46.
Toft U, et al. Relative Validity of a Food Frequency Questionnaire Used in the Inter99 Study. Eur J Clin Nutr. 2008;62(8):1038-46. PubMed PMID: 17538538.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relative validity of a food frequency questionnaire used in the Inter99 study. AU - Toft,U, AU - Kristoffersen,L, AU - Ladelund,S, AU - Bysted,A, AU - Jakobsen,J, AU - Lau,C, AU - Jørgensen,T, AU - Borch-Johnsen,K, AU - Ovesen,L, Y1 - 2007/05/30/ PY - 2007/6/1/pubmed PY - 2009/1/1/medline PY - 2007/6/1/entrez SP - 1038 EP - 46 JF - European journal of clinical nutrition JO - Eur J Clin Nutr VL - 62 IS - 8 N2 - OBJECTIVE: To evaluate the validity of the Inter99 food frequency questionnaire (FFQ) compared with a 28-days' diet history and biomarkers. SUBJECTS: A random sample of 13 016 individuals were drawn from a general population and invited for a health screening programme. Participation rate was 52.5%. All high-risk individuals were re-invited for assessment after 1 and 3 years and completed a 198-item FFQ at all three occasions. Participants attending for 3 years follow-up were invited to participate in the validation study, including a 28-days' diet history, a 24-h urine collection and a fasting blood sample. Overall, 264 subjects participated. RESULTS: Spearman's rank correlation coefficients between the two dietary methods ranged from 0.31(beta-carotene) to 0.64 (fruits) in men and from 0.31 (polyunsaturated fat and sodium) to 0.64 (fruits) for women. The proportion of individuals classified in the same or adjacent quintiles were, on average, 72% for men and 69% for women. Gross misclassification was found on average in 2%. The correlation coefficients of the residuals ranged from 0.27 (sodium) to 0.61 (fruits) for men and from 0.21 (sodium) to 0.62 (B12-vitamin) for women. Correlation coefficients between fruit and vegetable intake and carotenoids ranged from -0.08 (lycopene) to 0.44 (alpha-carotene). For the residuals the correlation coefficients ranged from -0.004 (lycopene) to 0.47 (alpha-carotene). CONCLUSION: The Inter99 FFQ and the residuals of the intake provide acceptable classification of individuals according to their dietary intakes and the FFQ gives a good quantitative measurement of key dietary components. SN - 0954-3007 UR - https://www.unboundmedicine.com/medline/citation/17538538/Relative_validity_of_a_food_frequency_questionnaire_used_in_the_Inter99_study_ L2 - https://doi.org/10.1038/sj.ejcn.1602815 DB - PRIME DP - Unbound Medicine ER -