facilitate monitoring of area-based socioeconomic disparities
in health data, we have extracted census tract level poverty data
for ALL census tracts in the United States, for 1980, 1990, and
2000, from the U.S.
Census. We have made these available as comma-delimited text
files for each year of the decennial Census (1980, 1990, and 2000)
with two fields per record.
first field is the 11-digit areakey (i.e. the
geocode) which uniquely identifies the census tract:
1-2 = State code
3-5 = County code
Digits 6-11 = Census Tract code (often used with a decimal point:xxxx.xx)
Digit 12 = Blockgroup code
our section on geocoding].
second field is the percent of people in the
census tract living below the federally defined poverty line:
To calculate the proportion of persons below poverty for this
region, we sum all categories P1170001 to P1170024 to get the
denominator, and sum categories P1170013 to P1170024 to get the
numerator, and then simply divide this numerator by the denominator:
+ … + P1170012) / (P1170001 + … + P1170024)
our section on generating ABSMs].
you have geocoded your own data, you can merge your data with
these CT-level poverty data, by areakey. [See SAS