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The social, housing and environmental variables considered. All factors were summarized at the census tract level for the two county study area. |
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| Variable |
Description |
Mean for all 1481 tracts in the study area |
|
|
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| Population density |
Housing units per square kilometer |
2.02 units/square kilometer |
| Income |
Median household income |
$48,031 |
| Race |
Percentage of population that is white |
54% |
| Age |
Median age of population |
33.7 years |
| Elevation |
Mean elevation |
192 meters above MSL |
| Elevation range |
9.0 meters |
|
| Vegetation |
Percentage vegetated |
21.3% |
| Positive bird specimens |
Meters from nearest positive bird |
1965 meters |
| Housing age |
Percentage of housing built 1940–1949 |
11.8% |
| Percentage of housing built 1950–1959 |
18.0% |
|
| Percentage of housing built 1940–1959 |
29.8% |
|
| Physiographic region |
In the Chicago Lake Plain region or outside |
Dummy variable |
| Mosquito Abatement District (MAD) status |
In one of four MADs, DuPage County or outside of those areas |
Dummy variables |
Ruiz et al. International Journal of Health Geographics 2004 3:8 doi:10.1186/1476-072X-3-8 |
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