NHANES Dietary Web Tutorial: Dietary Data Structure & Contents: Dietary Recall Data Files

Task 2: Key Concepts About Dietary Recall Data Files

Beginning in 2002, two 24-hour recalls were requested from all NHANES examinees. All Day 1 interviews were conducted at the Mobile Examination Center using an in-person mode of interview. The Day 2 recalls were collected approximately three to ten days after the examination using a telephone mode of interview.

The main data are captured in four files, found on the 2003-2004 Dietary Files page. (Note that additional data, derived from these main files, can be found on the USDA Web site. See “Module 4: Resources for Dietary Data Analysis” for more information.)

NHANES 24-Hour Recall Interview Data Files
Data File	File Name	Data Contained in the Data File
Dietary Interview (Individual Foods – First Day)	DR1IFF_C	Detailed description about foods reported (i.e. type, form, brand name, amount consumed) Amounts of nutrients from each food
Dietary Interview (Individual Foods – Second Day)	DR2IFF_C