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 Food Surveys Research Group: Beltsville, MD
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ARS Home Northeast Area Beltsville, Maryland (BHNRC) Beltsville Human Nutrition Research Center Food Surveys Research Group Docs





- FSRG Home Page
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- WWEIA
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- Food Surveys 1935-1998

WWEIA/NHANES 2017-2018headline bar  **Intake Days** Two days of dietary intake data are available. Day 1 is collected in person in the Mobile Examination Center. The Day 1 files include:
7,641 individuals with a complete intake
157 breastfed individuals
Day 2 is collected by telephone 3 to 10 days later. The Day 2 files include:
6,639 individuals with a complete intake
137 breastfed individuals  **Data File Descriptions** Four dietary intake files are available. **Individual Foods Files:  DR1IFF_J (Day 1) and DR2IFF_J (Day 2)** The Individual Foods Files include, for each interview day, one record for each food consumed by a participant.  Each record identifies the intake day of week, the time and name of the eating occasion for the food, and the following food-specific data:Food, identified by a USDA food code
Whether food was eaten in combination with other foods (for example, milk added to cereal)
Amount of food consumed
Amounts of food energy and 64 nutrients/food components provided by the food amount
**Total Nutrient Intakes Files:  DR1TOT_J (Day 1) and DR2IFF_J (Day 2)** The Total Nutrient Intakes Files contain, for each interview day, one record for each participant. Each record includes daily total intakes of food energy and 64 nutrients/food components, daily intake of water, and whether the amount of food consumed was usual, much more than usual, or much less than usual. The Day 1 file also includes information on salt use, whether the participant is on a special diet (weight loss, low carbohydrate, etc.), and  frequency of fish and shellfish consumption for population subsets.  **Sample Weights** Sample weights specific to the dietary intake data adjust for (a) the additional non-response and (b) the differential allocation by day of the week for the dietary intake data collection.
Two sets of weights—Day 1 weights (**WTDRD1**) are to be applied to Day 1 data; two-day weights (**WTDR2D**) are to be applied when both days are used (Day 1 and Day 2).
Read about the dietary intake sample weights in the analytical notes section of the documentation.


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