WWEIA/NHANES 2003-2004

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:
  • 8,894 individuals with a complete intake
  • 140 breastfed infants
• Day 2 is collected by telephone 3 to 10 days later. The Day 2 files include:
  • 8,220 individuals with a complete intake
  • 134 breastfed infants

Data File Descriptions

 

Four dietary intake files are available.

• Individual Foods Files:  DR1IFF_C (Day 1) and DR2IFF_C (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 62 nutrients/food components provided by the food amount
     
• Total Nutrient Intakes Files:  DR1TOT_C (Day 1) and DR2IFF_C (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 62 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

 

• 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).
• Read about the dietary intake sampling weights (page 13).