Wirfalt et al. respond to Drs. Block and Willett

Article Abstract:

Researchers agree with Walter C. Willett and Gladys Block that many studies have demonstrated the usefulness of food frequency questionnaires, but more information will be obtained with small surveys using interview administered instruments. The structure, cognitive processing, and measurement errors were similar in this study. Once error structures are better understood, researchers will be able to anticipate them in analysis.

Diet

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Invited commentary: comparison on the Block and the Willett food frequency questionnaires

Article Abstract:

Elisabet Wirfalt, Robert Jeffery, and Patricia Elmer used a reduced 60-item version of the Block questionnaire, which is accurate but not interesting. The Block questionnaire was designed to do a reasonable assessment of capturing the absolute value of nutrient intake, but these researchers used the brief instrument to make accurate point estimates.

Evaluation, Nutritional assessment

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Similar abstracts:

• Abstracts: Comparison of food frequency questionnaires: the reduced Block and Willett questionnaires differ in ranking on nutrient intakes

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