Neighborhood characteristic | 1993 a | 2001 | 2011 | Change b | P value c |
---|---|---|---|---|---|
Number of observations (neighborhoods) | 2083 | 2083 | 2083 | – | – |
Relative availability of sit-down restaurants and supermarkets | |||||
 Percent of sit-down restaurantsd, mean (SD) | 16.1 ± 33.1 | 22.7 ± 36.4 | 26.2 ± 36.8 | 10.1 ± 41.4 | < 0.05 |
 Percent of supermarketse, mean (SD) | 2.0 ± 11.9 | 2.4 ± 12.9 | 5.3 ± 19.6 | 3.3 ± 20.1 | < 0.05 |
Built environment characteristics | |||||
 Residential population density, 1000 person/km2, median (IQR) | 1.2 (1.6) | 1.2 (1.3) | 1.3 (1.3) | 0.0 (0.5) | < 0.05 |
 Employment population density, 1000 person/km2, median (IQR) | 0.6 (0.8) | 0.7 (0.7) | 0.7 (0.7) | 0.0 (0.1) | < 0.05 |
 Mix of land use f, median (IQR) | 45.0 (48.0) | 51.3 (49.7) | 57.0 (46.0) | 8.7 (20.4) | < 0.05 |
 Percent of single-family housingg, median (IQR) | 68.5 (65.4) | 73.2 (64,9) | 94.9 (36.8) | 16.3 (27.0) | < 0.05 |
 Total sit-down restaurants and fast food restaurants, median (IQR) | 0.0 (1.0) | 0.0 (2.0) | 1.0 (2.0) | 1.3 (3.2) | < 0.05 |
 Total supermarkets, grocery stores and convenience stores, median (IQR) | 0.0 (1.0) | 1.0 (1.0) | 1.0 (2.0) | 0.2 (1.2) | < 0.05 |
Sociodemographic characteristics | |||||
 Age, mean (SD) | |||||
  Percent of population under 14 | 22.2 ± 6.4 | 21.3 ± 6.8 | 19.9 ± 6.0 | − 2.3 ± 4.8 | < 0.05 |
  Percent of population 15–29 | 23.7 ± 7.3 | 20.9 ± 7.8 | 21.6 ± 8.4 | − 2.1 ± 4.6 | < 0.05 |
  Percent of population 30–44 | 27.2 ± 4.7 | 26.0 ± 4.8 | 21.9 ± 4.5 | − 5.3 ± 5.0 | < 0.05 |
  Percent of population 45–64 | 16.9 ± 5.0 | 21.2 ± 5.4 | 25.8 ± 5.7 | 8.9 ± 5.8 | < 0.05 |
  Percent of population 65 or above | 9.9 ± 6.6 | 10.5 ± 7.3 | 10.8 ± 6.0 | 0.9 ± 5.7 | < 0.05 |
 Percent of population with education level of college or above, mean (SD) | 57.6 ± 15.2 | 66.1 ± 14.9 | 68.1 ± 14.3 | 10.5 ± 8.6 | < 0.05 |
 Race, median (IQR) | |||||
  Percent of white race | 96.0 (5.0) | 90.6 (13.0) | 87.0 (16.0) | − 10.8 (11.6) | < 0.05 |
  Percent of black race | 1.0 (3.0) | 2.9 (5.1) | 4.0 (9.0) | 4.1 (7.2) | < 0.05 |
 Median household incomeh, $1000, mean (SD) | 38.2 ± 12.5 | 40.5 ± 15.1 | 37.1 ± 14.5 | 0.4 ± 7.5 | < 0.05 |
 Time elapsed from 1993, year, mean (SD) | 0 ± 0 | 8 ± 0 | 18 ± 0 | 18 ± 0 | – |