Skip to main content

Table 5 Overlap between RDFE and AS

From: Exploring factors affecting individual GPS-based activity space and how researcher-defined food environments represent activity space, exposure and use of food outlets

RDFE Mean AS (km2) Mean overlap (km2) % mean overlap Mean difference 95% CI for difference % mean difference p-value
Type Size Lower Upper
CBH 2 km 59.54 9.87 16.6 49.67 36.09 63.27 83.4  <  0.001*
  4 km 59.54 21.96 36.9 37.58 24.65 50.51 63.1  <  0.001*
  6 km 59.54 31.07 52.2 28.47 16.78 40.16 47.8  <  0.001*
CBW 2 km 59.54 8.66 14.5 50.88 37.18 64.59 85.5  <  0.001*
  4 km 59.54 19.08 32.0 40.46 27.34 53.59 68.0  <  0.001*
  6 km 59.54 28.88 48.5 30.66 18.76 42.58 51.5  <  0.001*
CBHW 2 km 59.54 16.35 27.5 43.19 29.94 56.45 72.5  <  0.001*
  4 km 59.54 31.42 52.8 28.12 16.48 39.78 47.2  <  0.001*
  6 km 59.54 40.61 68.2 18.93 9.59 28.27 31.8  <  0.001*
SNBH 2 km 59.54 5.08 8.5 54.46 40.75 68.18 91.5  <  0.001*
  4 km 59.54 15.22 25.6 44.32 30.79 57.85 74.4  <  0.001*
  6 km 59.54 24.07 40.4 35.47 22.65 48.3 59.6  <  0.001*
SNBW 2 km 59.54 4.67 7.8 54.87 41.26 68.49 92.2  <  0.001*
  4 km 59.54 13.84 23.2 45.70 32.32 59.09 76.8  < 0.001*
  6 km 59.54 22.65 38.0 36.89 24.21 49.58 62.0  <  0.001*
SLB 2 km 59.54 24.24 40.7 35.30 23.54 47.08 59.3  <  0.001*
  4 km 59.54 36.66 61.6 22.88 12.79 32.97 38.4  <  0.001*
  6 km 59.54 35.47 73.1 16.01 7.61 24.4 26.9  <  0.001*
2 SDE   59.54 35.47 59.6 24.07 18.41 29.74 40.4  <  0.001*
  1. N = 60, RDFE  Researcher-Defined Food Environment, AS  Activity space CBH  Circular Buffer around Home, CBW  Circular Buffer around Workplace, SNBH  Street Network Buffer around Home, SNBW  Street Network around Workplace, SLB  Straight-line Buffer, 2 SDE   2 Standard Deviational Ellipse. Note, CBHW is a union of circular buffers around home and workplace and not a sum of individual circular buffers