Table 3.
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 |
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.
Each row represents a separate model that adjusted for tract population density.
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.