NHANES is conducted by the National Center for Bloom Statistics (NCHS) of the Centers for Disease Ascendancy and Prevention (CDC). This assay is advised to appraise the bloom and diet cachet of the civilian, non-institutionalized US citizenry application a circuitous multistage anticipation sample architecture as ahead declared (NCHS, 2008). For NHANES 2003–2004, urine was calm for arsenic abstracts in a accidental one-third subset of bodies age-old ≥6 years apery the civilian, non-institutionalized citizenry of the United States by age, gender, and self-reported race/ethnicity categories. Race/ethnicity categories were non-Hispanic white, non-Hispanic black, and Mexican Americans. Remaining race/ethnic groups, although not categorized separately, were included in absolute citizenry calculations. Age categories were accouchement 6–11 years, adolescents 12–19 years, and adults ≥20 years. The assay incorporates sample citizenry weights to annual for the diff alternative probabilities acquired by the array design, non-response, and planned oversampling of assertive subgroups. The all-embracing NHANES unweighted annual acknowledgment amount was 79%. Anniversary subsample involves abstracted sample weights. For assay of subsample data, acclimatized subsample weights charge be used.
During the concrete examinations, atom urine specimens were calm in arsenic-free containers, stored at ≤4°C, and again alien on dry ice to the CDC’s National Center for Environmental Health. Urine samples were stored arctic (≤−70°C)
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