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Four instruments collect dietary data.

DHQ II

The Diet History Questionnaire (DHQ II) is an online food frequency questionnaire (FFQ) that asks about a list of foods eaten in the past 12 months. The usual frequency and portion size of these foods were self-reported by participants. Participants were asked to complete the DHQ2 twice, one year apart.

The food frequency files contain one record per food, with the two administrations split into different datasets. The nutrient file contains one record per person with an array of the two administrations.

You may view data dictionaries and formats for the DHQ files. Datasets can be obtained by submitting a request.

Summary Available Data
  • Self-reported data collected via a web-based FFQ
  • Completed the first and last month of the study, about 1 year apart
  • 1,007 participants with results
    • 710 completed both administrations
    • 206 completed only the 1st
    • 91 completed only the 2nd
  • Date and time
  • Demographics
  • Carbohydrate Constituents
  • Vitamins
  • Minerals
  • Carotenoids and Tocopherols
  • Other
  • Macronutrients and Energy
  • Fats, Fatty Acids and Cholesterol
  • Protein Constituents
  • My Pyramid Equivalents
  • Food Pyramid Equivalents

ASA24

The ASA24 is an online self-administered 24-hour recall of dietary data. It asks respondents to report the intake of all foods, beverages and supplements over the past 24 hours from midnight to midnight. The version used in IDATA was ASA24-2011. Foods, supplements, nutrients and MyPyramid equivalents data was compiled using the USDA Food and Nutrient Database for Dietary Studies (FNDDS) (version 4.1), the USDA MyPyramid Equivalents Database (MPED) (version 2.0), and the NHANES Dietary Supplement Database (DSD) (2007-08). More information on ASA24 can be found at: https://epi.grants.cancer.gov/asa24/

Participants were asked to complete six ASA24 recalls, two months apart. Each participant was allowed three attempts, assigned on different days, to complete each assigned ASA24 recall. A few participants provided more than one complete ASA24 recall.

The ASA24 files are provided two ways: one set of files includes all attempts (including incomplete attempts and extra complete attempts after the participant had already completed a recall for that administration) and another set has been created that includes only the 1st completed attempt in each of the 6 administrations. The latter set of data files, those containing only the 1st completed attempts) is recommended for analysis.

You may view data dictionaries and formats for the ASA24 files. Datasets can be obtained by submitting a request.

For more information, you may visit the ASA24 home page on the DCCPS website, and the ASA24 Demo.

Summary Available Data
  • Self-reported online data of diet for the previous day from midnight to midnight
  • Completed 6 times per person every 2 months
  • 994 participants with results
    • 666 completed all 6 administrations
  • My Selections file: food and supplement names from the Quick List, probe questions and answers
  • Individual Foods file: FNDDS food codes, gram weights and nutrients for each food reported.
  • Daily Total Nutrients file: FNDDS nutrients from all foods in a given day for each recall.
  • Individual Foods My Pyramid HEI file: FNDDS Food Codes, gram weights, My Pyramid Equivalents and Healthy Eating Index (HEI) Whole Fruits
  • Daily Total Nutrients My Pyramid HEI: Nutrients, My Pyramid Equivalents, and HEI Whole Fruits from all foods in a given day
  • Individual Supplements file: Supplement codes with their nutrients – keeping only those nutrients that are related to the FNDDS
  • Daily Total Supplements: Total nutrients from all supplements reported in a given day – keeping only those nutrients that are related to the FNDDS.
  • Daily Total Nutrients from Foods and Supplements: FNDDS nutrients from all foods and supplements reported in a given day.

7-Day Food Checklist

The 7-Day Food Checklist is a booklet of 7 identical paper questionnaires each to be completed daily over 7 consecutive days. The questionnaires ask respondents to check a box each time they eat one of the foods listed. The dataset provides the counts of each food for each day.

Participants were asked to complete two 7-Day Food Checklists, one year apart.

The 7-Day Food Checklist data is in two files, one per person and one per day.

After several rounds of cognitive testing, NCI has developed a machine scannable seven-day checklist instrument (PDF, 235 KB) to be coupled with NCI's FFQ, the Diet History Questionnaire II. The instrument has been administered in Re-OPEN, a new study in which OPEN participants have been contacted again and asked to complete additional dietary assessment instruments. Whether its use in conjunction with the DHQ II improves accuracy of self-reported dietary information is being analyzed.

You may view data dictionaries and formats for the 7-Day Food Checklist files. Datasets can be obtained by submitting a request.

For more information, you may visit the Daily Food Checklist instrument page on NCI's website.

Summary Available Data
  • Self report data
  • Completed the first and last month about 1 year apart
  • 928 participants with results
    • 751 completed both administrations
    • 138 completed only the 1st
    • 39 completed only the 2nd
  • Person File
    • Form Info
    • Food Summary
    • Administration 1 food counts
    • Administration 2 food counts
    • Administration 1 food maximums
    • Administration 2 food maximums
    • Administration 1 hybrid counts
    • Administration 2 hybrid counts
  • Day File
    • Form Info
    • Day Info
    • Food Checkboxes
    • Food Counts
    • Food Maximums
    • Food Hybrid Counts
    • Food Completion Status

4-Day Food Record

The 4-Day Food Record (4DFR) was a self-administered 4-day journal of dietary data. The data was collected as free response and was converted into food counts, and these datasets do not contain the free response answers. Foods, supplements, nutrients and MyPyramid equivalents data was compiled using the USDA Food and Nutrient Database for Dietary Studies (FNDDS), the USDA MyPyramid Equivalents Database (MPED).

The 4DFR files are provided two ways: one set of files includes the 2 administration attempts. The extra files contain extra administrations data for the 9 people who completed 3 administrations. The first set of data files, those not containing the extra administrations, are recommended for analysis.

Click here for data dictionaries and formats for the 4DFR files. Datasets can be obtained by submitting a request.

Summary Available Data
  • Self-reported data of everything that they consumed for four days.
  • Completed 2 times per person 6 months apart
  • 857 participants with results
    • 680 with both administrations
  • 847 participants with 4 days in an administration
    • 670 with 4 days in both administrations
  • Individual Foods File: FNDDS food codes, gram weights and nutrients for each food reported
  • Daily Total Nutrients File: FNDDS nutrients from all foods reported in a given day
  • Admin Summary File: FNDDS nutrients from all foods reported in each day in a given admin
  • Person Summary File: FNDDS nutrients from all foods reported in each day for a given person
  • Extra Administrations: Individual Foods File: FNDDS food codes, gram weights and nutrients for each food reported
  • Extra Administrations: Daily Total Nutrients File: FNDDS nutrients from all foods reported in a given day
  • Extra Administrations: Admin Summary File: FNDDS nutrients from all foods reported in each day in a given admin