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Table 2 Built and socioeconomic environment characteristics: descriptive statistics1

From: Built and socioeconomic environments: patterning and associations with physical activity in U.S. adolescents

Measure mean (SE) min 25th median 75th max
Street connectivity       
Alpha index 0.32 (0.01) -8 0.22 0.30 0.38 8
Intersection density 29.5 (1.65) 0 8.6 26.4 44.6 168.1
Population density 1,410 (182) 0.05 128 794 1,779 29,961
Landscape diversity       
Mean patch size 30,196 (1,566) 7,411 14,213 88,250 32 315,000
Patch size variability 171,517 (6,853) 21,151 19,147 131,745 52 939,810
Land patch density 52.4 (1.7) 3.2 32.5 52.2 70.4 134.9
Simpson's diversity index 0.54 (0.01) 0.01 0.45 0.58 0.67 0.83
Contagion index 48.3 (0.9) 9.1 36.2 45.8 57.9 98.3
Perimeter-fractal dimension 1.48 (0.01) 1.06 1.44 1.50 1.54 1.67
Physical activity facilities       
Instruction 2.3 (0.2) 0 0 1 3 100
Member 2.0 (0.2) 0 0 1 3 52
Outdoor 1.2 (0.1) 0 0 1 2 15
Public 0.9 (0.1) 0 0 0 1 22
Public fee 1.4 (0.1) 0 0 1 2 22
Youth organization 1.3 (0.2) 0 0 0 2 38
Parks 4.7 (0.5) 0 0 1 8 44
Census measures       
% below poverty 0.15 (0.01) 0 0.06 0.11 0.21 0.85
% ≥ college education 0.23 (0.01) 0.01 0.13 0.19 0.29 0.82
% minority 0.21 (0.02) 0 0.02 0.08 0.29 1
Median household income 29,753 (935) 4,999 21,003 28,462 35,643 125,053
% homeowners 0.68 (0.01) 0 0.56 0.72 0.83 0.98
Crime rate 5,476 (237) 108 3,523 5,528 6,975 13,723
  1. 1 National Longitudinal Study of Adolescent Health, Wave I (1995-96), n = 18,294. Excludes built environment characteristics examined but not included in subsequent analysis