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Open Access Research

Assessing validity of a short food frequency questionnaire on present dietary intake of elderly Icelanders

Tinna Eysteinsdottir13*, Inga Thorsdottir12, Ingibjorg Gunnarsdottir12 and Laufey Steingrimsdottir12

Author Affiliations

1 Unit for Nutrition Research, University of Iceland and Landspitali National-University Hospital, Reykjavik, Iceland

2 Faculty of Food Science and Human Nutrition, School of Health Sciences, University of Iceland, Reykjavik, Iceland

3 Unit for Nutrition Research, Landspitali-University Hospital, Eiriksgata 29, IS-101 Reykjavik, Iceland

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Nutrition Journal 2012, 11:12  doi:10.1186/1475-2891-11-12

Published: 13 March 2012

Additional files

Additional file 1:

Gender-specific portions (g) were estimated taking into account actual intake in grams and eating occasions from food diaries, as well as predetermined portion sizes used in a previous validation study of questions on midlife diet.

Format: DOC Size: 39KB Download file

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Open Data

Additional file 2:

Shows the results from the nonparametric Jonckheere-Terpstra test for trend performed to assess whether the AGES-FFQ ranked mean intake from the food record in an anticipated, graded order.

Format: DOC Size: 168KB Download file

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Open Data

Additional file 3:

Shows the results from Pearson Chi-Square and Kendall's tau-b tests performed to further assess the association between the two different dietary assessment methods.

Format: DOC Size: 40KB Download file

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Open Data