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© 1992 Oxford University Press

other

Influence of Individually Estimated Portion Size Data on the Validity of a Semiquantitative Food Frequency Questionnaire

ANNE TJøNNELAND*, JÓHANNA HARALDSDÓTTIR**, KIM OVERVAD{dagger}, CONNIE STRIPP*, MARIANNE EWERTZ* and OLE MøLLER JENSEN{ddagger}

*Danish Cancer Reqistry, Institute of Cancer Epidemiology, Danish Cancer Society Rosenvængets Hovedvej 35, PO Box 839. DK-2100 Copcnhagen, Denmark
**Research Department of Human Nutrition, The Royal Veterinary and Agricultural University Rolighedsvej 25, DK-1958 Frederiksberg C, Denmark
{dagger}Institute of Epidemiology and Social Medidne, Aarhus University Høegh-Guldbergs Gade 8, DK-8000 Århus C, Denmark
{dagger} Deceased

Tjønneland A (Danish Cancer Registry, Institute of Cancer Epidemiology, Danish Cancer Society, Rosenvoegets Hovedvej 35, PO Box 839, DK-2100 Copenhagen, Denmark), Haraldsdóttir J, Overvad K, Stripp C, Ewertz M and Jensen O M. Influence of individually estimated portion size data on the validity of a semiquantitative food frequency questionnaire. International Journal of Epidemiology 1992; 21: 770–777.

Using data from a Danish dietary validity study, we evaluated the influence of including individually estimated portion size data on the validity of a semiquantitative food frequency questionnaire. A total of 144 subjects, aged 40–64 years were included.

Correlation coefficients and classification of subjects into quintiles according to their intake of foods and nutrients were used to compare questionnaire data, with and without individually estimated portion size data, with data obtained by 2 × 7 days weighed diet records.

For men, the mean correlation coefficient for food group comparisons was 0.47 when information about individually estimated portion sizes for food items that do not come in natural units was included in the analysis. Using a common averege portion size reduced the mean correlation coefficient to 0.45. For women, similar changes were observed (0.36 to 0.36). For nutrients the mean values for the comparison changed from 0.51 to 0.49 and from 0.39 to 0.40 for men and women, respectively.

For both men and women the classification into quintiles according to their intake of foods and nutrients showed only minor differences.

We conclude that little extra information was gained by including individual portion size information for food items that do not come in natural units. This may reflect that portion sizes are of minor importance compared with frequencies or that the relevant individual portion sizes were not estimated correctly.

Received 1 March 1992


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