Four instruments collect dietary data.
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.