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Table 1 Descriptive statistics for King County, Washington State, USA

From: Arterial roads and area socioeconomic status are predictors of fast food restaurant density in King County, WA

  Countywide a All tracts b
(n = 373)
Tracts with fast
food restaurants b
(n = 198)
Tracts without fast
food restaurants b
(n = 175)
variable mean (sd) mean (sd) mean (sd) mean (sd)
Total populationc 1737034 4657 (1518) 4964 (1595) 4379 (1391)
Population density (n/sq km)c 315 2074 (2005) 2314 (2443) 1858 (1477)
Area (km2)c, d 5519 14.8 (95.2) 13.1 (81.8) 16.7 (108.5)
Arterial density (km/km2)d 0.77 3.45 (3.39) 4.16 (3.98) 2.62 (2.31)
% Living below povertyc 7.62 7.7 (6.67) 9.47 (7.32) 5.69 (5.16)
% Nonwhitea 24.27 23.62 (16.18) 26.50 (16.50) 20.37 (15.21)
Median household income (USD)c 53157 57047 (19569) 50097 (16528) 64910 (19805)
Fast food density (n/km2)d 0.11 0.81 (2.14) 1.53 (2.74)  
Fast food density (n/1000 persons)d 0.35 0.39 (0.82) 0.75 (1.00)  
Mean network distance from residential dwelling
unit to the closest fast food restaurant (km)d
1.20 (.090)   1.07 (0.77) 1.88 (0.85)
  1. a summary statistics generated from non-aggregate data
  2. b summary statistics generated from tract-aggregated data
  3. c source: US Census (2000)
  4. d source: King County GIS (2007)