Table 1

Quartile distributions of U.S. Census SES variables in ZIP Codes with TB cases, 1996–2005
Cut-points (%) or ($)
Percent of population 25 and over that attended any college (Education)
 1 – Low SES 0 – 39.4
 2 39.5 – 51.5
 3 51.5 – 65.9
 4 – High SES 65.9 – 100.0
Percent of housing units with one or more persons per room (Crowding)
 1 – Low SES 7.6 – 65.6
 2 3.7 – 7.6
 3 1.8 – 3.7
 4 – High SES 0 – 1.8
Average per capita income in 1999 (Income)
 1 – Low SES 3729 – 16 016
 2 16 017 – 20 040
 3 20 041 – 26 224
 4 – High SES 26 225 – 114 359
Percent of population in the civilian workforce that was unemployed in 1999 (Unemployment)
 1 – Low SES 7.5 – 83.9
 2 5.0 – 7.5
 3 3.5 – 5.0
 4 – High SES 0 – 3.4

Olson et al.

Olson et al. BMC Public Health 2012 12:365   doi:10.1186/1471-2458-12-365

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