Intra- and inter-individual variability in location data for two U.S. health-compromised elderly cohorts

Journal of Exposure Science & Environmental Epidemiology
Emma L FrazierBarbara Jane George

Abstract

This study provides descriptive statistical data on daily time spent in three locations of exposure assessment interest for two panel studies of health-compromised elderly individuals >65-year-old having multiple days of human activity data. The panel studies include individuals living in Los Angeles (CA) and Baltimore (MD) in various housing types. Three general locations are evaluated: outdoors, in vehicles, and total indoors. Of particular interest is providing information regarding the within- and between-individual variability in the time use data for the three locations. The data are analyzed using non-parametric statistics and alternative statistical models. Within and between variability are evaluated using intraclass correlation coefficients (ICCs); daily "lag-one" autocorrelation coefficients are also provided for the two samples. There were significant gender differences for selected seasonal and/or day-of-the-week metrics for: (1) outdoor time in Los Angeles, but not in Baltimore, and (2) in-vehicle time in both areas. Elderly women spent more time in these locations than similarly aged men. The ICC statistic indicates that most of the variability in the time spent in the three locations is due to intraindividual va...Continue Reading

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Citations

Oct 11, 2012·Journal of Exposure Science & Environmental Epidemiology·Kristin IsaacsDaniel Vallero
Aug 29, 2013·Journal of Toxicology and Environmental Health. Part a·Joachim D Pleil, Jon R Sobus
Sep 22, 2011·Environmental Health : a Global Access Science Source·Xiangmei WuIrva Hertz-Picciotto

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