TABLE 2-1 Design Features and Relevant Content for Food and Nutrition Research of Four Surveys: the National Health and Nutrition Examination Survey (NHANES), the Continuing Survey of Food Intakes by Individuals (CSFII), the Diet and Health Knowledge Survey (DHKS), and the Consumer Expenditure Survey (CE)

Feature

NHANES

CSFII

Time Period

Continuing since 1999; released at approximately 2-year intervals, with data pooled for 2 years for reliability

Conducted most recently in 1989-1991, 1994-1996, and 1998 (children aged 0-9 only); folded into NHANES in 2002

Universe

Civilian noninstitutionalized population

1994-1996: Same as NHANES

Design

Each year about 11,000 households screened in 15 primary sampling units (counties); about 3,000 households identified with 6,000 eligible people, of whom 5,000-5,500 interviewed and 4,600-5,200 examined in mobile exam centers (MEC)

Oversampling of blacks, Mexican-Americans, low-income people not black or Mexican (beginning in 2000), people aged 12-19 or aged 60 and over, pregnant women

1994-1996:15,000 people in households (5,000 people per year) provided dietary intake information

Oversampling of low-income people

Major Questionnaire Components

Household screeners; Family questionnaire; Sample person questionnaire; MEC audio computer-assisted self interview; MEC computer-assisted personal interview; MEC dietary recall; MEC examination; MEC laboratory analysis

Household interview; First-day in-person dietary recall; Second-day in-person dietary recall



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