Table 3.
Spatial Clustering of Fast Food Restaurants Within 220 Census Tracts, St Louis, Mo
| Possible Cluster Identified | Observed No. of Fast Food Restaurants | Expected No. of Fast Food Restaurants | Ratio of Observed to Expected No. of Fast Food Restaurants | Population in Cluster (No. of Census Tracts) | Log Likelihood Ratio (P) | |
| All fast food restaurants (unadjusted) | ||||||
| 1 | 31 | 73.3 | 0.4 | 187,873 (52) | 18.65 (.001) | |
| 2 | 30 | 8.8 | 3.4 | 22,432 (4) | 16.37 (.001) | |
| 3 | 20 | 6.3 | 3.2 | 16,052 (4) | 9.76 (.02) | |
| 4 | 6 | 0.5 | 12.0 | 1,280 (1) | 9.46 (.03) | |
| All fast food restaurants (adjusted for racial composition and poverty rate) | ||||||
| 1 | 1 | 15.0 | 0.1 | 42,378 (8) | 11.56 (.004) | |
| 2 | 30 | 9.8 | 3.1 | 22,432 (4) | 13.97 (.001) | |
| 3 | 20 | 8.9 | 2.6 | 16,052 (4) | 5.33 (.69) | |
| 4 | 6 | 0.6 | 10.7 | 1,280 (1) | 8.82 (.053) | |
| Fast food restaurants in highest tertilea (unadjusted) | ||||||
| 1 | 11 | 38.0 | 0.3 | 289,181 (75) | 17.43 (.001) | |
| 2 | 23 | 7.7 | 3.0 | 58,512 (17) | 10.97 (.01) | |
| Fast food restaurants in highest tertilea (adjusted for racial composition and poverty rate) | ||||||
| 0 | 0 | 7.0 | 0.0 | 105,184 (22) | 7.20 (.18) | |
a
Each restaurant and supermarket was assigned a rating of high, medium, or low potential for meeting dietary intake recommendations as established by the U.S. Department of Agriculture (27).