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NHANES: A Potential Database for Risk Assessment

NHANES: A Potential Database for Risk Assessment. Clifford Johnson. Centers for Disease Control and Prevention National Center for Health Statistics. National Health and Nutrition Examination Survey (NHANES). Objective

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NHANES: A Potential Database for Risk Assessment

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  1. NHANES: A Potential Database for Risk Assessment Clifford Johnson Centers for Disease Control and Prevention National Center for Health Statistics

  2. National Health and Nutrition Examination Survey (NHANES) • Objective • To assess the health and nutritional status of adults and children in the United States OP96S022

  3. National Health and Nutrition Examination Surveys Survey Dates Ages NHES I 1960-62 18-79 years NHES II 1963-65 6-11 years NHES III 1966-70 12-17 years NHANES I 1971-75 1-74 years NHANES II 1976-80 6 mo.-74 years HHANES 1982-84 6 mo.-74 years NHANES III 1988-94 2 mo. + NHANES 1999- All ages OP96S025

  4. NHANES sample design • Continuous data collection beginning in 1999 • Multi-stage probability sample • Annual national sample of 5,000 persons • Detailed estimates of population subgroups requires two or more years

  5. NHANES process Identification of sample persons Interview Mobile Examination Center Home Examination Longitudinal Followup OP96S028

  6. NHANES household interview • Broad range of health conditions • Health care coverage and need • Environmental and occupational exposures • Health behaviors • Nutrition and dietary supplements OP96S039

  7. NHANES Mobile Exam Center

  8. NHANES topics • Cardiovascular disease • Diabetes, lower extremity disease • Bone status, osteoporosis • Oral health • Vision • Hearing and balance • Fitness and strength OP96S035

  9. NHANES topics • Nutrition • Anthropometry • Mental health • Risk behaviors • Reproductive health • Environmental exposures • Infectious diseases OP96S036

  10. NHANES nutrition assessments • Dietary nutrient intake • Anthropometric measurements • Nutritional biochemistries and hematologic tests • Physical examination • Interview OP96S060

  11. NHANES 1999-2001 Dietary Assessment • 24-hour dietary recall (automated ) • Second day recall on subset of persons • Food frequency (focused) • General questions • Supplements/medications (detailed) • Food security

  12. NHANES 2002 Dietary Assessment • 24-hour dietary recall (new USDA automated system) • Second day recall on ALL persons (telephone) • Food frequency (focused) • General questions • Supplements/medications (detailed) • Food security

  13. MEC laboratory • CBC and differential • Pregnancy test • Blood, urine and vaginal swab processing • 76 different vials of samples • 26 laboratories • 300 laboratory assays

  14. Environmental exposure measures • Lead • Cadmium • Mercury • Pesticides • Selenium • Cotinine • Urinary Iodine • Volatile organic compounds

  15. National Report on Human Exposure to Environmental Chemicals First report - 27 environmental chemicals including: • Metals • Cotinine • Organophosphate pesticide metabolites • Phthalate metabolites Updated annually

  16. Dietary data for future NHANES • Continue collection of two recalls on all sample persons • Pilot test in 2002 of a longer food frequency questionnaire • Monitor respondent burden • Balance competing needs --- usual intake, total intake (nutrients vs. foods), food safety, supplement use, DHKS, food programs and health components

  17. NHANES web site http://www.cdc.gov/nchs/nhanes.htm OP96S058

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