Day 1 is collected in person in the Mobile Examination Center. The Day 1 files include:
9,169 individuals with a complete intake
180 breastfed infants
Day 2 is collected by telephone 3 to 10 days later. The Day 2 files include:
8,264 individuals with a complete intake
165 breastfed infants
Data File Descriptions
Four dietary intake files are available.
Individual Foods Files: DR1IFF_D (Day 1) and DR2IFF_D (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 63 nutrients/food components provided by the food amount
Total Nutrient Intakes Files: DR1TOT_D (Day 1) and DR2IFF_D (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 63 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.
Sampling weights specific to the dietary intake data adjust for over-representation of weekend days.
Two sets of weights—Day 1 weights (WTDRD1) are applied to Day 1 data; two-day weights (WTDR2D) are applied when both days are used (Day 1 and Day 2).