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NHEXAS PHASE I ARIZONA STUDY

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WARNING! DATA USE RESTRICTIONS

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The EPA does all it can to ensure that the identity of survey participants cannot be disclosed. All direct identifiers, as well as any characteristics that might lead to identifications, are omitted from the data. Any intentional identification or disclosure of a person or establishment violates the assurances of confidentiality given to the providers of the information. Therefore, users will (1) use the data in this study for statistical reporting and analysis only; (2) make no use of the identity of any person or establishment discovered inadvertently and will advise the HEDS Administrator of any such discovery; (3) will not link this data with individually identifiable data from other EPA or non-EPA data.

By using the data you signify your agreement to comply with the above-stated statutorily based requirements.

Description:

The National Human Exposure Assessment Survey (NHEXAS) is a federal interagency research effort coordinated by the Environmental Protection Agency (EPA), Office of Research and Development (ORD). The objective of the NHEXAS Phase I Arizona study was to determine the distributions of total human exposures to multimedia pollutants in the classes of metals, pesticides, and volatile organic compounds (VOCs). This was achieved by studying a proportion-based sample of the total population in Arizona with a nested design for the different stages of sampling. Specific objectives were: (1) to document the occurrence, distribution, and determinants of total exposures in the general population; (2) to characterize the 90th percentiles of total exposures to each pollutant; (3) to monitor geographic and temporal trends of the multimedia exposures; (4) to evaluate the different media, personal, time-activity, and geographical factors that contribute to current total exposure; (5) to evaluate biomarkers in blood and urine for the target pollutants; (6) to perform evaluations of relationships between exposure reports, environmental measurements, and biomarkers of the target pollutants; (7) to predict total exposures; and (8) to assess total exposures in minority and disadvantaged subsets of the population. The latter was particularly feasible in Arizona due to the large proportions of such population subgroups. The proportionate-based population sampling of households within blocks occurred in Stage 1; the target is 1,200 such households. These households were interviewed utilizing NHEXAS questionnaires. In Stage 2, additional questionnaires were completed; environmental sampling took place in 450-900 households representatively selected from the respondents. Environmental sampling included: metals in dust, soil, outside air, and some tap water; pesticides in dust, soil, and some tap water; total VOCs in air. In stage 3, a subset of representative households were reevaluated for metals, pesticides, and VOCs using methods with greater resolution and reliability; subjects in these households were asked to complete questionnaires and provide biological samples. Follow-up temporal evaluations were performed in a randomly selected subset of homes evaluated during this stage. The study was conducted by a consortium composed of the University of Arizona, Battelle Columbus, and the Illinois Institute of Technology. Data collection occurred between June 1995 and February 1998 for the participating households. Keywords: NHEXAS; Arizona; Epidemiology; Exposure

NOTE: The U.S. Environmental Protection Agency (EPA), through its Office of Research and Development (ORD), partially funded and collaborated in the research described here. Mention of trade names or commercial products does not constitute endorsement or recommendation by EPA for use.

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HEDS STUDIES

STUDY DIRECTORY

Record Details:

Record Type:PROJECT
Start Date:01/01/1995
Record ID: 23159