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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 food eaten in the past 12 months. The frequency and quantity of these foods were recorded.

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. The raw questionnaire contains one record per person per administration with their responses to the questionnaire.

Click here for 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 trial, about 1 year apart ~1,010 participants with results ~710 completed both administrations ~205 completed only the 1st ~90 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 HEI 2010 and 2015 Scores

ASA24

The ASA24 was an online self-administered 24-hour recall of dietary data. 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/

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.

Click here for data dictionaries and formats for the ASA24 files. Datasets can be obtained by submitting a request.

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 ~995 participants with results ~665 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 questionnaires each to be completed daily over 7 consecutive days. The questionnaires ask respondents to check a boxy each time they one of the foods listed. The dataset provides the counts of each food for each day.

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

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

Summary	Available Data
Self report data Completed the first and last month about 1 year apart ~930 participants with results ~750 completed both administrations ~140 completed only the 1^st ~40 completed only the 2^nd	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 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 food patterns equivalents data was compiled using the USDA Food and Nutrient Database for Dietary Studies (FNDDS) and the USDA Food Patterns Equivalents Database (FPED).

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 ~855 participants with results ~680 with both administrations ~845 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