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Relative validity and reliability of a food frequency questionnaire in youth with type 1 diabetes
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Mar 28 2014
Source: Public Health Nutr. 18(3):428-437. -
Alternative Title:Public Health Nutr
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Description:Objective
To evaluate the relative validity and reliability of the SEARCH food frequency questionnaire (FFQ) that was modified from the Block Kids Questionnaire.
Design
Study participants completed the 85-item FFQ twice plus three 24-hour dietary recalls within one month. We estimated correlations between frequencies obtained from participants with true usual intake for food groups and nutrients, using a two-part model for episodically-consumed foods and measurement error adjustment.
Setting
The multi-center SEARCH for Diabetes in Youth Nutrition Ancillary Study.
Subjects
A subgroup of 172 participants aged 10 - 24 years with type 1 diabetes.
Results
The mean correlations adjusted for measurement error of food groups and nutrients between FFQ and true usual intake were 0.41 and 0.38, respectively, with 57% of the food groups and 70% of the nutrients exhibiting correlations >0.35. Correlations were high for low-fat dairy (0.80), sugar-sweetened beverages (0.54), cholesterol (0.59) and saturated fat (0.51), while correlations were poor for high fiber bread and cereal (0.16) and folate (0.11). Reliability of FFQ intake based on two FFQ administrations was also reasonable with 54% of Pearson correlation coefficients ≥ 0.5. Reliability was high for low fat dairy (0.7), vegetables (0.6), carbohydrates, fiber, folate and vitamin C (all 0.5), but less than desirable for low fat poultry and high fiber bread, cereal, rice and pasta (0.2-0.3).
Conclusions
While there is some room for improvement, our findings suggest that the SEARCH FFQ performs quite well for the assessment of many nutrients and food groups in a sample of youth with type 1 diabetes.
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Pubmed ID:24679679
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Pubmed Central ID:PMC4353637
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