Welcome NHANES Participants
If selected for this survey, your participation is important.
How was I selected?
|All the counties in the United States are divided into 15 groups based on their characteristics. One county is selected from each large group, and together they form the 15 counties in the NHANES surveys for each year.|
|Within each county, smaller groups (with a large number of households in each group) are formed, and between 20 and 24 of these small groups are selected.|
|All of the houses or apartments within those selected small groups are identified, and a sample of about 30 households are selected within each group.|
|NHANES interviewers go to each selected household and ask for information (age, race, and gender) on all persons in the household.|
|A computer algorithm randomly selects some, all, or none of the household members.|
What does participation involve?
First, we find out if you’re eligible. An NHANES interviewer will come to your home and ask you a few questions about you and the other members of your household. NHANES interviewers always have identification with them that they will show you immediately. Once you answer a few questions, the interviewer will let you know if you are needed to participate further. Click here if you are asked to participate in the next stage.
What are the benefits to me and my family?
If you participate in NHANES, you will find out more about your overall health and the health of your family than you ever would at a routine doctor’s visit. Your interviewer will explain the benefits of participation with you.
How do you keep my information secure?
NCHS is committed to protecting your privacy. More information on confidentiality can be found in our Confidentiality Brochure.
How do I know this is a legitimate survey?
NHANES has a long history (see history of NHANES); it has been in existence since 1960 and has surveyed over 190,000 people. NHANES was born out of the The National Health Survey Act, 1956. This law authorized a survey to provide current statistical data on the amount, distribution, and effects of illness and disability in the United States. Many organizations support our survey. For a full list of organizations that endorse NHANES, see letters of endorsement.
Watch a short video about participating in NHANES
Vea un corto video acerca de la participación en NHANES
- Chinese (Simplified)
请观看关于参加 NHANES 调查的短片
- Chinese (Traditional)
觀賞有關參與 NHANES 調查的短片
Regardez une vidéo courte sur la participation dans NHANES
- Haitian Creole
Gade yon videyo kout sou patisipasyon nan NHANES
एनहेन्स सर्वेक्षण (NHANES) में प्रतिभाग लेने के बारे में यह संक्षिप्त वीडियो देखें।
NHANES 참여에 관한 비디오 보기
Xin xem video ngắn về việc tham gia NHANES
ይህንን አጭር ቢድዮ ስለ የጤንነትና የአመጋገብ ጥናት ተሳታፊ ለመሆን ይመልከቱ
Who can I contact if I have questions?
To discuss the survey or to speak to our Senior Medical Officer, call us at 1-800-452-6115. If you have questions about your rights as a survey participant, call the Research Ethics Review Board at the National Center for Health Statistics at 1-800-223-8118. Leave a brief message containing your name, phone number, and your NHANES concerns. Your call will be returned as soon as possible.
- Page last reviewed: June 30, 2016
- Page last updated: June 30, 2016
- Content source: