Data from this survey will be used in epidemiological studies and health sciences research, which help develop sound public health policy, direct and design health programs and services, and expand the health knowledge for the Nation.
As in past health examination surveys, data will be collected on the prevalence of chronic conditions in the population. Estimates for previously undiagnosed conditions, as well as those known to and reported by respondents, are produced through the survey. Smoking, alcohol consumption, sexual practices, drug use, physical fitness and activity, weight, and dietary intake will be studied.
Data on certain aspects of reproductive health, such as use of oral contraceptives and breastfeeding practices, will also be collected. The sample for the survey is selected to represent the U. Since the United States has experienced dramatic growth in the number of older people during this century, the aging population has major implications for health care needs, public policy, and research priorities. NCHS is working with public health agencies to increase the knowledge of the health status of older Americans.
All participants visit the physician. Dietary interviews and body measurements are included for everyone. All but the very young have a blood sample taken and will have a dental screening. Depending upon the age of the participant, the rest of the examination includes tests and procedures to assess the various aspects of health listed above.
In general, the older the individual, the more extensive the examination. Health measurements are performed in specially-designed and equipped mobile centers, which travel to locations throughout the country. The study team consists of a physician, medical and health technicians, as well as dietary and health interviewers. An advanced computer system using high-end servers, desktop PCs, and wide-area networking collect and process all of the NHANES data, nearly eliminating the need for paper forms and manual coding operations.
This system allows interviewers to use notebook computers with electronic pens. The staff at the mobile center can automatically transmit data into data bases through such devices as digital scales and stadiometers.
Touch-sensitive computer screens let respondents enter their own responses to certain sensitive questions in complete privacy. Survey information is available to NCHS staff within 24 hours of collection, which enhances the capability of collecting quality data and increases the speed with which results are released to the public.
In each location, local health and government officials are notified of the upcoming survey. Local media may feature stories about the survey.
Transportation is provided to and from the mobile center if necessary. Participants receive compensation and a report of medical findings is given to each participant.
All information collected in the survey is kept strictly confidential. Privacy is protected by public laws. Information from NHANES is made available through an extensive series of publications and articles in scientific and technical journals. For data users and researchers throughout the world, survey data are available on the internet and on easy-to-use CD-ROMs. Research organizations, universities, health care providers, and educators benefit from survey information.
Primary data users are federal agencies that collaborated in the design and development of the survey. The complex design features should be used in estimating standard errors for the descriptive statistics. Data elements, laboratory tests performed, and the technological sophistication of medical examination and laboratory equipment have changed over time.
Therefore, trend analyses should carefully examine how specific data elements were collected across the various NHANES surveys. Hyattsville, Maryland. Skip to main content. Google Tag Manager. Visit coronavirus. Office of Disease Prevention and Health Promotion.
Search HealthyPeople. In This Section:. National Health and Nutrition Examination Survey. Data Years Available:. From , a total of seven national examination surveys were conducted.
Beginning in , the survey has been conducted continuously. Continuous since ; a minimum of 2 data years is required for analyses. Mode of Collection:. In-person interviews in the household or in a private setting in the mobile examination center. Standardized physical examinations and medical tests in mobile examination centers. Selected Content:. Data are collected on chronic disease prevalence and conditions including undiagnosed conditions and risk factors such as obesity and smoking, serum cholesterol levels, hypertension, diet and nutritional status, immunization status, infectious disease prevalence, health insurance, and measures of environmental exposure.
Other topics addressed include hearing, vision, mental health, anemia, diabetes, cardiovascular disease, osteoporosis, oral health, mental health, pharmaceuticals and dietary supplements used, and physical fitness. The National Report on Human Exposures to Environmental Chemicals provides unique exposure information to scientists, physicians, and health officials to help prevent disease that results from exposure to environmental chemicals.
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