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. Author manuscript; available in PMC: 2009 Aug 3.
Published in final edited form as: Biomark Med. 2008;2(4):335–348. doi: 10.2217/17520363.2.4.335

Figure 4. County and census tract boundaries for the study area in NC, USA.

Figure 4

Gradations in exposure distributions for the two primary variables of interest (non-Latino Black and age-associated poverty), and for median census tract IL-6. Graphical maps of descriptive data for census tract variables, census tract boundaries and interstate highway locations were created using ARCGIS software (version 9.1, Environmental Systems Research Institute, Inc., CA, USA).