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