Diet History Questionnaire: Validation Studies
The DHQ instrument is currently in use in several NCI epidemiological studies such as
The Prostate, Lung, Colorectal, and Ovarian Screening Trial (PLCO) and The Agricultural
Health Study (AHS). Data show that the instrument provides reasonable nutrient estimates,
and three studies were conducted to assess its validity/calibration.
The first validation used a checklist approach. The resulting data showed that most of
the cognitive enhancements incorporated in the DHQ were an improvement over the 1992
NCI/Block questionnaire for frequency.
Thompson FE, Subar AF, Brown CC, Smith AF, Sharbaugh CO, Jobe JB, Mittl B, Gibson JT, Ziegler RG. Cognitive
research enhances accuracy of food frequency questionnaire reports: results of an experimental validation study. J
Am Diet Assoc 2002 Feb;102(2):212-25. [View PDF]
The second validation, conducted in 1997-1998, compared the DHQ instrument to two FFQs
available at that time -- the 1995 Block and Willett (purple version) food frequency
questionnaires. The validation used four 24-hour dietary recalls (one in each season) as
reference data. The study showed the DHQ to be as good as or superior to these Block and
Willett instruments for most nutrients. (Please note: The Block and Willett
questionnaires used in this validation are not the current versions of these FFQs.)
Subar AF, Thompson FE, Kipnis V, Midthune D, Hurwitz P, McNutt S, McIntosh A, Rosenfeld S. Comparative Validation
of the Block, Willett, and National Cancer Institute Food Frequency Questionnaires: The Eating at America's Table
Study. Am J Epidemiol 2001;154:1089-99. [View Summary]
The third validation study compares intake of absolute energy and protein estimated on
the DHQ with unbiased biomarkers of intake, doubly labeled water (for energy expenditure)
and urinary nitrogen (for protein). The Observing Protein and Energy Nutrition (OPEN)
Study showed significant underreporting and measurement error for the DHQ.
See the research summaries Using Intake Biomarkers to Evaluate the Extent of Dietary Misreporting
and Structure of Dietary Measurement Error for
more information about this validation study.
|