TABLE 3.
Descriptive statistics of food environment measures, by geographic definition, food outlet type, and buffer size (n=20,331)
| Census tract | “Classic” network buffer | Sausage network buffer | |
|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | |
|
| |||
| Supermarkets | |||
| Density, tailoreda | 0.12 (0.48) | 0.22 (0.40) | 0.22 (0.46) |
| Density, 1 kmb | 0.26 (0.45) | 0.25 (0.57) | |
| Density, 5 kmc | 0.25 (0.36) | 0.22 (0.34) | |
| Density, 8 km | 0.18 (0.28) | 0.20 (0.31) | |
| Density, 16 km | 0.14 (0.23) | 0.16 (0.25) | |
| Percentage, tailoreda | 6.9 (11.7) | 11.7 (7.8) | 11.6 (8.2) |
| Percentage, 1 kmb | 8.1 (13.0) | 6.9 (15.7) | |
| Percentage, 5 kmc | 10.4 (11.0) | 10.9 (8.9) | |
| Percentage, 8 km | 11.2 (6.3) | 11.1 (7.0) | |
| Percentage, 16 km | 11.2 (4.4) | 11.2 (4.4) | |
| Fast food restaurants | |||
| Density, tailoreda | 0.55 (1.19) | 0.69 (0.90) | 0.66 (0.95) |
| Density, 1 kmb | 0.74 (1.10) | 0.67 (1.35) | |
| Density, 5 kmc | 0.77 (0.86) | 0.71 (0.74) | |
| Density, 8 km | 0.59 (0.63) | 0.65 (0.66) | |
| Density, 16 km | 0.48 (0.56) | 0.55 (0.58) | |
| Percentage, tailoreda | 27.4 (23.9) | 32.6 (14.6) | 32.0 (15.2) |
| Percentage, 1 kmb | 21.3 (23.4) | 16.0 (25.0) | |
| Percentage, 5 kmc | 27.7 (19.1) | 29.7 (16.3) | |
| Percentage, 8 km | 31.2 (12.2) | 30.9 (13.4) | |
| Percentage, 16 km | 31.6 (9.3) | 31.5 (9.5) | |
NOTE: 1-km and 8-km network buffer measures were calculated using walking distance, and other distances were calculated using driving distance.
a
Measure is tailored to the community type (high-density urban, low-density urban, suburban/small town, rural) of participants’ residential census tract.
b
“Classic” network buffer distances for “one-size-fits-all” measures are 1 mile (~1.6 km), 2 miles (~3.2 km), 6 miles (~9.7 km), and 10 miles (~16.1 km).