Statistical properties of longitudinal time-activity data for use in human exposure modeling.


Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Isaacs, K; McCurdy, T; Glen, G; Nysewander, M; Errickson, A; Forbes, S; Graham, S; McCurdy, L; Smith, L; Tulve, N; Vallero, D

Published Date

  • May 2013

Published In

Volume / Issue

  • 23 / 3

Start / End Page

  • 328 - 336

PubMed ID

  • 23047319

Pubmed Central ID

  • 23047319

Electronic International Standard Serial Number (EISSN)

  • 1559-064X

International Standard Serial Number (ISSN)

  • 1559-0631

Digital Object Identifier (DOI)

  • 10.1038/jes.2012.94


  • eng