The Public Health Disparities
Geocoding Project Monograph

Geocoding and Monitoring US Socioeconomic Inequalities in Health:
An introduction to using area-based socioeconomic measures
WHY?
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HOW TO
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Executive Summary
Introduction
Publications
Geocoding
Generating ABSMs
Analytic Methods
Multi-level Modeling
Visual Display
Case Example
U.S. Census Tract Poverty Data
Glossary
VISUAL DISPLAY

A visual display of the data can offer a dramatic and succinct representation of the socioeconomic disparities in your data. Often, graphical representations provide a means of communicating key features of the data, and can enhance summary presentations of data in tabular form. For example, as part of our project, we produced a series of booklets – one for each health outcome, at each level of geography. Each page of the booklet summarized the standardized incidence rates, rate ratio, rate differences, relative index of inequality, and population attributable fraction, for each ABSM, and was supplemented by a visual display of the incidence rates in each category of the ABSM, and the population distribution of the ABSM. Figure 1 below shows a sample booklet page summarizing the analysis of all cause mortality in Suffolk County, Massachusetts, by CT poverty. (This is the same analysis presented in our case example). Similar pages could be constructed to summarize all cause mortality by % working class, % less than high school education, etc.


Figure 1. Booklet page

Maps of Census derived ABSMs can also give a dramatic visual representation of how socioeconomic conditions are distributed geographically. In the figure below, we mapped CT level poverty in Suffolk County, MA, using ArcView/ArcGIS.

Figure 2.
Map of Suffolk County, MA poverty

Mapping of disease rates at the census tract level can present complications, however, because rates for small areas are often unstable due to small numbers. For this reason, and because our focus was on area-based socioeconomic disparities in health across all of Massachusetts and Rhode Island, rather than within specific census tracts, we explicitly chose not to map disease rates as part of this project.  

Another way of displaying the data is shown in Figure 2 from the Introduction. In these graphs, which we newly apply to routinely collected U.S. state health department data1-3, the width of each bar is proportional to the size of the population in the specified socioeconomic statum4. We created these graphs in S-plus. Here's an example of this mode of graphing applied to our case example.

Figure 3.
Graph of Suffolk County, MA poverty by
All-cause mortality

REFERENCES
1. Krieger N, Chen JT, Waterman PD, Soobader M-J, Subramanian SV, Carson R. Geocoding and monitoring US socioeconomic inequalities in mortality and cancer incidence: does choice of area-based measure and geographic level matter?—The Public Health Disparities Geocoding Project. Am J Epidemiol 2002;156:471-82.
2. Krieger N, Chen JT, Waterman PD, Soobader M-J, Subramanian SV, Carson R. Choosing area-based socioeconomic measures to monitor social inequalities in low birthweight and childhood lead poisoning –The Public Health Disparities Geocoding Project (US). J Epidemiol Community Health 2003;57:186-99.
3. Krieger N, Chen JT, Waterman PD, Soobader M-J, Subramanian SV. Monitoring socioeconomic inequalities in sexually transmitted infections, tuberculosis, and violence: geocoding and choice of area-based socioeconomic measures—The Public Health Disparities Geocoding Project (US). Public Health Reports 2003;118:240-260.
4. Wagstaff A, Paci P, van Doorslaer E. On the measurement of inequalities in health. Soc Sci Med 1991;33:545-57.
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This work was funded by the National Institutes of Health (1RO1HD36865-01) via the National Institute of Child Health & Human Development (NICHD) and the Office of Behavioral & Social Science Research (OBSSR).
Copyright © 2004 by the President and Fellows of Harvard College - The Public Health Disparities Geocoding Project.