National Center for Health Statistics

National Health and Nutrition Examination

Survey

OP96S002

National Health and Nutrition Examination

Survey (NHANES)

Objective

To assess the health and

nutritional status of adults and

children in the United States

OP96S022

National Health and NutritionExamination Surveys

NHES I 1960-62 18-79 yearsNHES II 1963-65 6-11 yearsNHES III 1966-70 12-17 yearsNHANES I 1971-75 1-74 yearsNHANES II 1976-80 6 mo.-74 yearsHHANES 1982-84 6 mo.-74 yearsNHANES III 1988-94 2 mo. +NHANES 1999- All ages

Survey Dates Ages

OP96S025

NHANES topics

• Cardiovascular disease

• Diabetes, lower extremity disease

• Bone status, osteoporosis

• Oral health

• Vision

• Hearing and balance

• Fitness and strengthOP96S035

NHANES topics

• Nutrition

• Anthropometry

• Mental health

• Risk behaviors

• Reproductive health

• Environmental exposures

• Infectious diseases

OP96S036

NHANES survey methods

Eligible population

• Civilian, non-institutionalized household population

• All states and D.C.

• All ages

OP96S030

NHANES sample design

Oversample

• African Americans

• Mexican Americans

• Adolescents aged 12-19

• Older persons aged 60+

• Pregnant women

• Low income whites

OP96S031

Stage 4SPs

Stage 1Counties Stage 2

Segments Stage 3

Households

OP96S017

NHANES information flow

Advanceletter Screening In-home

interviewExam

Biologic Specimens

Lab NCHS Participant

Informed consent

OP96S032

OP96S033

OP96S034

Pentop handheld computer

Pentop handheld computer

Field interviews

OP96S038

NHANES Mobile Exam Center

OP96S041

NHANES mobile examination centers

• Standard environment

• Standard equipment

• Standard specimen collection

• Standard staff procedures

• Automated data collection

• Minimal site-specific errorOP96S043

NHANES Mobile Examination Center

(MEC)staff• Physician

• Dentist

• Dietary interviewers (2)

• Private health interviewers (2)

• Health technicians (3)

• Phlebotomist (1)

• Manager

• CoordinatorOP96S046

Health Examination

•Exam duration 1-4 hours

•Remuneration $100

•Several examinations, private health interviews

•Participants receive exam findings

OP96S053

On day of exam Preliminary report of findings; referrals

1-2 weeks Notification of

abnormal values - (letter sent by mail)

NHANES report of findings

Time after exam Report

OP96S047

4 weeks Sexually transmitted disease test reporting (self-initiated telephone reporting, toll-free line)

12-16 weeks Final report of findings(sent by mail)

NHANES report of findings

Time after exam Report

OP96S048

NHANES key response rates

1999 2000 2001Current

total

Interviewed 78 85 86 83

MEC examined 71 80 81 78

Percent

ISIS architecture

h i

Household interviews Westat

home office

T1T1

NCHS

Labs&

graders

T1

MEC

64kb

Fieldoffic

e

NationalFrame Relay

Network

OP96S049

Data release process

•QA/QC

•Editing/cleanup

•Weighting

•Data preparation

•Documentation

•Confidentiality review

OP96S053

NHANES data dissemination

Public use files

•1999-2000 NHANES available on internet as of June 21, 2002

Plan for 2001-2002 release in 2004 and 2003-2004 release in 2006

OP96S054

NHANES web site

http://www.cdc.gov/nchs/nhanes.htm

OP96S058

Reports and Data Briefs 1999 NHANES

•Blood and hair mercury levels

•Blood lead levels

•Folate status in women

•Prevalence of overweight

•National report on human exposures to environmental chemicals

OP96S053