TB rates by SES variables for foreign-born residents from the most common countries of origin. Each panel illustrates the association between TB rates and a different U.S. Census 2000 ZIP Code measure of SES for persons born in the Philippines, Vietnam, India, China, and Mexico. The U.S. Census defines education (Panel A) as the percentage of the population 25 and older in the Zip Code Tabulation Area (ZCTA) with any college attendance; crowding (Panel B) as the percentage of housing units in the ZCTA with more than one person per room; income (Panel C) as per capita income in the ZCTA in 1999; and unemployment (Panel D) as the percentage of the total population in the ZCTA area’s civilian labor force that was unemployed in 1999.
Olson et al. BMC Public Health 2012 12:365 doi:10.1186/1471-2458-12-365