Document Detail

Statistical properties of longitudinal time-activity data for use in human exposure modeling.
MedLine Citation:
PMID:  23047319     Owner:  NLM     Status:  Publisher    
Understanding the longitudinal properties of the time spent in different locations and activities is important in characterizing human exposure to pollutants. The results of a four-season longitudinal time-activity diary study in eight working adults are presented, with the goal of improving the parameterization of human activity algorithms in EPA's exposure modeling efforts. Despite the longitudinal, multi-season nature of the study, participant non-compliance with the protocol over time did not play a major role in data collection. The diversity (D)-a ranked intraclass correlation coefficient (ICC)- and lag-one autocorrelation (A) statistics of study participants are presented for time spent in outdoor, motor vehicle, residential, and other-indoor locations. Day-type (workday versus non-workday, and weekday versus weekend), season, temperature, and gender differences in the time spent in selected locations and activities are described, and D & A statistics are presented. The overall D and ICC values ranged from approximately 0.08-0.26, while the mean population rank A values ranged from approximately 0.19-0.36. These statistics indicate that intra-individual variability exceeds explained inter-individual variability, and low day-to-day correlations among locations. Most exposure models do not address these behavioral characteristics, and thus underestimate population exposure distributions and subsequent health risks associated with environmental exposures.Journal of Exposure Science and Environmental Epidemiology advance online publication, 10 October 2012; doi:10.1038/jes.2012.94.
Kristin Isaacs; Thomas McCurdy; Graham Glen; Melissa Nysewander; April Errickson; Susan Forbes; Stephen Graham; Lisa McCurdy; Luther Smith; Nicolle Tulve; Daniel Vallero
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-10
Journal Detail:
Title:  Journal of exposure science & environmental epidemiology     Volume:  -     ISSN:  1559-064X     ISO Abbreviation:  J Expo Sci Environ Epidemiol     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101262796     Medline TA:  J Expo Sci Environ Epidemiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
US Environmental Protection Agency, Research Triangle Park, NC, USA.
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