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Table 6 Geographic variation in physical activity and the built environment

From: Using built environment characteristics to predict walking for exercise

  ZIP code Census tract Census block group
  ICC (95% CI) ICC (95% CI) ICC (95% CI)
Walking for exercise    
   Some versus none 0.003 (0.000, 0.025) 0.000 (0.000, 0.051) 0.000 (0.000, 0.102)
   Minutes per weekab 0.000 (0.000, 0.036) 0.046 (0.000, 0.129) 0.055 (0.000, 0.211)
Built environment characteristics    
   Residential density of 1-km buffera 0.739 (0.680, 0.799) 0.920 (0.907, 0.932) 0.953 (0.946, 0.960)
   Connectivity of 1-km buffera 0.784 (0.731, 0.836) 0.879 (0.861, 0.897) 0.931 (0.920, 0.941)
   Park area within 1-km buffera 0.330 (0.255, 0.405) 0.601 (0.554, 0.648) 0.778 (0.746, 0.809)
  1. Notes: ICC indicates intra-class correlation coefficient; CI indicates confidence interval; except where otherwise indicated N = 1,608
  2. a Log-transformed to approximate normality
  3. b Among participants reporting some walking for exercise: N = 1,000