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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: Prev Med. 2010 Apr 18;51(1):63–67. doi: 10.1016/j.ypmed.2010.04.009

Table 3.

Incidence rate ratios of food stores for African-American census tracts, New Orleans, LA, 2004-2005 a

Store Type b IRR 95% CI c p-value
Supermarkets 0.64 0.49 to 0.83 0.00
Medium Groceries 0.96 0.77 to 1.21 0.74
Small Food Stores 1.19 0.90 to 1.56 0.22
Convenience Stores 0.92 0.77 to 1.11 0.39
General Merchandise Stores 1.58 1.10 to 2.26 0.01
a

Incidence rate ratios are based on Poisson regression models. Values less than 1 indicate that there are fewer stores than the reference group. Reference category is mixed racial tracts, i.e. less than 80% African-American residents.

b

Each row represents a separate model that adjusted for tract population density.

c

Confidence intervals for small food store and convenience store IRRs were adjusted for over-dispersion by scaling standard errors using the square root of the Pearson chi-square dispersion estimate.