This set of restricted data contains indirect identifying and/or sensitive information collected in continuous NHANES since 1999. Please refer to the links below for additional data available from NHANES: NHANES Public Use Data at: https://wwwn.cdc.gov/nchs/nhanes/Default.aspx NHANES Genetic Restricted Data at: https://data.cdc.gov/dataset/National-Health-and-Nutrition-Examination-Survey-N/hdx4-e4uu NHANES Restricted Data: Prior to 1999 at: https://data.cdc.gov/dataset/National-Health-and-Nutrition-Examination-Survey-N/ic32-yq9m NHANES National Youth Fitness Survey (NNYFS) Restricted Data at: https://data.cdc.gov/dataset/3-NHANES-National-Youth-Fitness-Survey-NNYFS-Restr/5u84-m4rs Please refer to the NHANES Analytic Guidelines at: https://wwwn.cdc.gov/nchs/nhanes/analyticguidelines.aspx and the on-line NHANES Tutorial at: https://wwwn.cdc.gov/nchs/nhanes/tutorials/default.aspx for further details on the survey design, implementation, and data analysis.