SAVI Community Trends Report: Unequal Access Tobacco Epidemic Report 2017 FINAL - Page 6
SAVI community trends » unequal access: tobacco retail in the indianapolis metro area
To measure density, we included both retailer
density and network density, which accounts
for an individual’s ability to walk or drive to
a nearby retailer. Retailer accessibility differs
from network density in that it examines the
proportion of the tract area within 500 meters
(approximately 1/3 mile) – considered a walk-
able distance. [25, 48-50] The objective of
calculating this metric was to identify the
tracts where an individual may be exposed
more often to the presence of tobacco retailers
(and, potentially, tobacco marketing).
We calculated the access score and then
clustered census tracts into groupings for
further analysis. We grouped tracts based on
Jenks calculations, which maximize variation
between groups while minimizing variation
within groups, using the following score ranges:
Low access tracts (scores ranged from
0.10 – 8.53, n=229);
Medium access tracts (8.80– 22.42, n=112);
High access tracts (22.66 – 43.27, n=56).
All charts and maps were produced by The Polis Center at Indiana University Purdue University Indianapolis, March 2017.
TOBACCO ACCESS IN CENTRAL INDIANA
Tobacco retailers not only provide access to tobacco product, but also expose
people to tobacco marketing.
Figure 2. Results