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A Bayesian approach to retrospective exposure assessment.

Authors
Ramachandran-G; Vincent-JH
Source
Appl Occup Environ Hyg 1999 Aug; 14(8):547-557
NIOSHTIC No.
20031342
Abstract
A variety of health effects are caused by chronic, cumulative exposure over time to pollutants. In these cases, to establish dose-response relationships for epidemiological and risk assessment purposes, it is vital to determine the exposures of individuals or cohorts as functions of time. Most existing occupational exposure databases, however, do not contain continuous records of historical exposures to airborne contaminants. These gaps in the historical record may be filled by using the knowledge base that experts and professionals in the field possess. In this article we present a new framework, based on Bayesian probabilistic reasoning, for obtaining estimates of exposure histories for airborne particulates from limited historical measurements, using subjective expert judgment. The framework has great potential applications in instances where there is sparse information or missing data on past exposures. Expert judgment, in the form of inputs to physical models, provides additional knowledge to retrospectively estimate exposure as a function of time from discrete and incomplete measurements. The expert judgments are informed by knowledge of historical plant conditions and work practices, and models describing process-dependent aerosol generation, ventilation, and worker activity patterns. The result will be probability distributions of the exposure of task-groups of workers as a function of time, in the form of a matrix.
Keywords
Exposure-levels; Statistical-analysis; Dose-response; Epidemiology; Risk-factors; Risk-analysis; Models; Exposure-levels; Work-environment
Contact
Gurumurthy Ramachandran, PhD, CIH, Division of Environmental and Occupational Health, School of Public Health, University of Minnesota, Box 807, Mayo, 420 Deleware St. SE, Minneapolis, MN 55455
CODEN
AOEHE9
Publication Date
19990801
Document Type
Journal Article
Funding Amount
159641
Funding Type
Grant
Fiscal Year
1999
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-000160
Issue of Publication
8
ISSN
1047-322X
Priority Area
Research Tools and Approaches: Risk Assessment Methods
Source Name
Applied Occupational and Environmental Hygiene
State
MN
Performing Organization
School of Public Health, University of Minnesota, Minneapolis, Minnesota
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