To summarize, sewage workers are exposed to multiple chemicals from multiple pathways resulting in a complicated matrix of exposure to chemicals and concentrations.
We developed a checklist containing six unique sets of yes/no variables organized in a 2 × 3 matrix of exposure potential versus exposure protection at three levels corresponding to a simplified hierarchy of controls: materials, processes, and human interface.
Thus, the generation of data at the local community level should be an ongoing, integrative process that allows for the identification of high risk groups as an initial step towards understanding how the experience of demographic and socioeconomic statuses become part of a complex matrix of exposures implicated in poor mental and physical health.
Alternative methods and matrices of BPA exposure assessment should be considered in future studies.
However, for both matrices of the prenatal exposure measures, we observed a consistent overall pattern of positive associations of POP exposures with the masculine score among boys and of negative associations among girls.
A job exposure matrix with assignment of exposure by job title alone is another way to identify external or objective ratings.
BPA ingested in humans is almost completely metabolized and rapidly excreted, so urine is considered the most appropriate matrix for assessment of exposure (Calafat et al. 2005).
Second, meconium could be used as a matrix for biomarkers of exposure in research studies that enroll women at or shortly after parturition, but does require additional resources to collect and analyze.
Others have modeled the spread of VZV, using time-of-exposure matrices to capture the mixing between different individuals (Zagheni et al., 2008) and how they change through time (Whitaker and Farrington, 2004).
Blood and urine are currently used for the biologic monitoring of workers exposed to Cr (Franchini and Mutti 1988; Mutti et al. 1984, 1985), and thus represent the gold standard matrices for the assessment of exposure.
