Key Concepts About Using the Frequently Asked Questions (FAQs)

One of the most important resources on the NHANES website is the FAQ section. The FAQs will help you with common questions about NHANES, such as

• When will more data be available from the survey?
• Will data and weights be available on public use files for single years such as 1999, 2000, or 2001?
• Why are there so many data files?
• What is the sample size for a particular for a particular data item, questionnaire section, examination component, or laboratory analyte?
• How are missing values, "blank but applicable", "don't know" and other values coded?